#1007704 (C++17) No.2873 Kendall's Tau

提出ソース
結果

問題	No.2873 Kendall's Tau
ユーザー	hamamu
提出日時	2024-09-06 22:20:12
言語	C++17 (gcc 12.3.0 + boost 1.83.0)
結果	WA
実行時間	-
コード長	40,537 bytes
コンパイル時間	5,399 ms
コンパイル使用メモリ	300,352 KB
実行使用メモリ	26,076 KB
最終ジャッジ日時	2024-09-06 22:20:25
合計ジャッジ時間	10,004 ms
ジャッジサーバーID （参考情報）	judge4 / judge5
このコードへのチャレンジ
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テストケース

テストケース表示
入力	結果	実行時間実行使用メモリ
testcase_00	AC	2 ms 6,816 KB
testcase_01	AC	2 ms 6,940 KB
testcase_02	AC	1 ms 6,944 KB
testcase_03	AC	2 ms 6,944 KB
testcase_04	AC	2 ms 6,940 KB
testcase_05	AC	2 ms 6,944 KB
testcase_06	AC	2 ms 6,944 KB
testcase_07	WA	-
testcase_08	WA	-
testcase_09	WA	-
testcase_10	WA	-
testcase_11	WA	-
testcase_12	WA	-
testcase_13	AC	65 ms 9,012 KB
testcase_14	WA	-
testcase_15	AC	35 ms 7,052 KB
testcase_16	AC	37 ms 6,996 KB
testcase_17	WA	-
testcase_18	WA	-
testcase_19	WA	-
testcase_20	AC	38 ms 7,628 KB
testcase_21	WA	-
testcase_22	AC	52 ms 8,652 KB
testcase_23	WA	-
testcase_24	AC	17 ms 6,944 KB
testcase_25	AC	33 ms 6,944 KB
testcase_26	WA	-
testcase_27	WA	-
testcase_28	WA	-
testcase_29	WA	-
testcase_30	AC	28 ms 6,948 KB
testcase_31	AC	51 ms 7,832 KB
testcase_32	WA	-
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ソースコード

raw source code
#if !defined(MYLOCAL)//提出時用テンプレート

#pragma GCC optimize("Ofast")
#if defined(NDEBUG)
#undef NDEBUG
#endif
#include "bits/stdc++.h"
#if __has_include(<atcoder/all>)
#include <atcoder/all>
using namespace atcoder;
#endif
using namespace std;
using ll=long long;
using dd=long double;
using pll=pair<ll,ll>;
using tll=tuple<ll,ll,ll>;
using qll=tuple<ll,ll,ll,ll>;
using ll2=array<ll,2>;
using ll3=array<ll,3>;
using ll4=array<ll,4>;
using namespace chrono;
constexpr ll INF = 1201001001001001001;
struct Fast{ Fast(){ cin.tie(0); ios::sync_with_stdio(false); cout<<fixed<<setprecision(numeric_limits<double>::max_digits10); } } fast;
#define EXPAND( x ) x//VS用おまじない
#define overload3(_1,_2,_3,name,...) name
#define overload4(_1,_2,_3,_4,name,...) name
#define overload5(_1,_2,_3,_4,_5,name,...) name
#define rep1(N)          for (ll dmyi = 0; dmyi < (N); dmyi++)
#define rep2(i, N)       for (ll i = 0; i < (N); i++)
#define rep3(i, S, E)    for (ll i = (S); i <= (E); i++)
#define rep4(i, S, E, t) for (ll i = (S); i <= (E); i+=(t))
#define rep(...) EXPAND(overload4(__VA_ARGS__,rep4,rep3,rep2,rep1)(__VA_ARGS__))
#define dep3(i, E, S)    for (ll i = (E); i >= (S); i--)
#define dep4(i, E, S, t) for (ll i = (E); i >= (S); i-=(t))
#define dep(...) EXPAND(overload4(__VA_ARGS__, dep4, dep3,_,_)(__VA_ARGS__))
#define ALL1(v)     (v).begin(),     (v).end()
#define ALL2(v,E)   (v).begin(),     (v).begin()+((E)+1)
#define ALL3(v,S,E) (v).begin()+(S), (v).begin()+((E)+1)
#define all(...) EXPAND(overload3(__VA_ARGS__, ALL3, ALL2, ALL1)(__VA_ARGS__))
#define RALL1(v)     (v).rbegin(),     (v).rend()
#define RALL2(v,E)   (v).rbegin(),     (v).rbegin()+((E)+1)
#define RALL3(v,S,E) (v).rbegin()+(S), (v).rbegin()+((E)+1)
#define rall(...) EXPAND(overload3(__VA_ARGS__, RALL3, RALL2, RALL1)(__VA_ARGS__))
template<class T> inline bool chmax(T &a, T b) { if (a < b) { a = b; return true; }return false; }
template<class T> inline bool chmin(T &a, T b) { if (a > b) { a = b; return true; }return false; }
template<class T> inline auto maxe(T &&v,ll S,ll E){ return *max_element(all(v,S,E)); }
template<class T> inline auto maxe(T &&v){ return *max_element(all(v)); }
template<class T> inline auto mine(T &&v,ll S,ll E){ return *min_element(all(v,S,E)); }
template<class T> inline auto mine(T &&v){ return *min_element(all(v)); }
template<class T,class U=typename remove_reference<T>::type::value_type>
inline U sum(T &&v,ll S,ll E) {return accumulate(all(v,S,E),U());}
template<class T> inline auto sum(T &&v) {return sum(v,0,v.end()-v.begin()-1);}
template<class T> inline ll sz(T &&v){ return (ll)v.size(); }
inline ll Ceil(ll a,ll b){ return (a<0) ? -(-a/b) : (a+b-1)/b; } //負もOK
inline ll Floor(ll a,ll b){ return -Ceil(-a,b); } //負もOK
inline ll Floormod(ll a,ll m){ return Floor(a,m)*m; } //負もOK
inline ll Ceilmod(ll a,ll m){ return Ceil(a,m)*m; } //負もOK
inline ll Mod(ll a,ll m){ ll r=a%m; if(r<0)r+=m; return r; } //負もOK
template<class T> inline T Pow(T a,ll n){ T r=1; for(; n>0; n>>=1,a*=a){ if(n&1)r*=a; } return r; }
inline ll Pow(int a,ll n){ return Pow((ll)a,n); }
inline ll limitmul(ll a,ll b,ll u){ return b==0||a<=u/b ? a*b : u; }//min(a*b,u) a,b,u≧0

//pair用テンプレート
template<class T,class S> inline pair<T,S>& operator+=(pair<T,S> &a,const pair<T,S> &b){ a.first+=b.first; a.second+=b.second; return a; }
template<class T,class S> inline pair<T,S>& operator-=(pair<T,S> &a,const pair<T,S> &b){ a.first-=b.first; a.second-=b.second; return a; }
template<class T,class S> inline pair<T,S>& operator*=(pair<T,S> &a,const pair<T,S> &b){ a.first*=b.first; a.second*=b.second; return a; }
template<class T,class S> inline pair<T,S>& operator/=(pair<T,S> &a,const pair<T,S> &b){ a.first/=b.first; a.second/=b.second; return a; }
template<class T,class S> inline pair<T,S>& operator%=(pair<T,S> &a,const pair<T,S> &b){ a.first%=b.first; a.second%=b.second; return a; }
template<class T,class S,class R> inline pair<T,S>& operator+=(pair<T,S> &a,R b){ a.first+=b; a.second+=b; return a; }
template<class T,class S,class R> inline pair<T,S>& operator-=(pair<T,S> &a,R b){ a.first-=b; a.second-=b; return a; }
template<class T,class S,class R> inline pair<T,S>& operator*=(pair<T,S> &a,R b){ a.first*=b; a.second*=b; return a; }
template<class T,class S,class R> inline pair<T,S>& operator/=(pair<T,S> &a,R b){ a.first/=b; a.second/=b; return a; }
template<class T,class S,class R> inline pair<T,S>& operator%=(pair<T,S> &a,R b){ a.first%=b; a.second%=b; return a; }
template<class T,class S,class R> inline pair<T,S> operator+(const pair<T,S> &a,R b){ pair<T,S> c=a; return c+=b; }
template<class T,class S,class R> inline pair<T,S> operator-(const pair<T,S> &a,R b){ pair<T,S> c=a; return c-=b; }
template<class T,class S,class R> inline pair<T,S> operator*(const pair<T,S> &a,R b){ pair<T,S> c=a; return c*=b; }
template<class T,class S,class R> inline pair<T,S> operator/(const pair<T,S> &a,R b){ pair<T,S> c=a; return c/=b; }
template<class T,class S,class R> inline pair<T,S> operator%(const pair<T,S> &a,R b){ pair<T,S> c=a; return c%=b; }
template<class T,class S,class R> inline pair<T,S> operator-(R b,const pair<T,S> &a){ pair<T,S> c=-a; return c+=b; }
template<class T,class S> inline pair<T,S> operator-(const pair<T,S> &a,const pair<T,S> &b){ pair<T,S> c=a; return c-=b; }
template<class T,class S> inline pair<T,S> operator-(const pair<T,S> &a){ pair<T,S> c=a; return c*=(-1); }
template<class T,class S> inline ostream &operator<<(ostream &os,const pair<T,S> &a){ return os << a.first << ' ' << a.second; }

//tuple用テンプレート 出力用のみ
template<class T,class S,class R> inline ostream &operator<<(ostream &os,const tuple<T,S,R> &a){ return os << get<0>(a) << ' ' << get<1>(a) << ' ' << get<2>(a); }
template<class T,class S,class R,class Q> inline ostream &operator<<(ostream &os,const tuple<T,S,R,Q> &a){ return os << get<0>(a) << ' ' << get<1>(a) << ' ' << get<2>(a) << ' ' << get<3>(a); }

//vector用テンプレート
template<class T> inline ostream &operator<<(ostream &os,const vector<T> &a){ for (ll i=0; i<(ll)a.size(); i++) os<<(i>0?" ":"")<<a[i];  return os; }

//array用テンプレート
template<class T,size_t S> inline array<T,S>& operator+=(array<T,S> &a,const array<T,S> &b){ for (ll i=0; i<(ll)S; i++) a[i]+=b[i];  return a; }
template<class T,size_t S> inline array<T,S>& operator-=(array<T,S> &a,const array<T,S> &b){ for (ll i=0; i<(ll)S; i++) a[i]-=b[i];  return a; }
template<class T,size_t S> inline array<T,S>& operator*=(array<T,S> &a,const array<T,S> &b){ for (ll i=0; i<(ll)S; i++) a[i]*=b[i];  return a; }
template<class T,size_t S> inline array<T,S>& operator/=(array<T,S> &a,const array<T,S> &b){ for (ll i=0; i<(ll)S; i++) a[i]/=b[i];  return a; }
template<class T,size_t S> inline array<T,S>& operator%=(array<T,S> &a,const array<T,S> &b){ for (ll i=0; i<(ll)S; i++) a[i]%=b[i];  return a; }
template<class T,size_t S,class R> inline array<T,S>& operator+=(array<T,S> &a,R b){ for (T &e: a) e+=b;  return a; }
template<class T,size_t S,class R> inline array<T,S>& operator-=(array<T,S> &a,R b){ for (T &e: a) e-=b;  return a; }
template<class T,size_t S,class R> inline array<T,S>& operator*=(array<T,S> &a,R b){ for (T &e: a) e*=b;  return a; }
template<class T,size_t S,class R> inline array<T,S>& operator/=(array<T,S> &a,R b){ for (T &e: a) e/=b;  return a; }
template<class T,size_t S,class R> inline array<T,S>& operator%=(array<T,S> &a,R b){ for (T &e: a) e%=b;  return a; }
template<class T,size_t S,class R> inline array<T,S> operator+(const array<T,S> &a,R b){ array<T,S> c=a; return c+=b; }
template<class T,size_t S,class R> inline array<T,S> operator-(const array<T,S> &a,R b){ array<T,S> c=a; return c-=b; }
template<class T,size_t S,class R> inline array<T,S> operator*(const array<T,S> &a,R b){ array<T,S> c=a; return c*=b; }
template<class T,size_t S,class R> inline array<T,S> operator/(const array<T,S> &a,R b){ array<T,S> c=a; return c/=b; }
template<class T,size_t S,class R> inline array<T,S> operator%(const array<T,S> &a,R b){ array<T,S> c=a; return c%=b; }
template<class T,size_t S,class R> inline array<T,S> operator-(R b,const array<T,S> &a){ array<T,S> c=-a; return c+=b; }
template<class T,size_t S> inline array<T,S> operator-(const array<T,S> &a,const array<T,S> &b){ array<T,S> c=a; return c-=b; }
template<class T,size_t S> inline array<T,S> operator-(const array<T,S> &a){ array<T,S> c=a; return c*=(-1); }
template<class T,size_t S> inline ostream &operator<<(ostream &os,const array<T,S> &a){ for (ll i=0; i<(ll)S; i++) os<<(i>0?" ":"")<<a[i];  return os; }

inline struct{
  system_clock::time_point st = system_clock::now();
  ll operator()()const{return duration_cast<microseconds>(system_clock::now()-st).count()/1000;}
} timeget;

struct cinutil{
  template<class T> static void cin1core(T &a){ cin>>a; }
  template<class T,class S> static void cin1core(pair<T,S> &a){
    cin1core(a.first), cin1core(a.second);
  }
  template<class... Args> static void cin1core(tuple<Args...> &a){
    cinTplRec<tuple<Args...>,sizeof...(Args)-1>()(a);
  }
  template<class T,size_t N>
  static void cin1core(array<T,N> &a){for(int i=0;i<(int)N;++i) cin>>a[i];}
private:
  template<class Tpl,int i> struct cinTplRec{
    void operator()(Tpl &a){ cinTplRec<Tpl,i-1>()(a); cin1core(get<i>(a)); }
  };
  template<class Tpl> struct cinTplRec<Tpl,0>{
    void operator()(Tpl &a){ cin1core(get<0>(a)); }
  };
};
template<class T> T cin1(){ T a; cinutil::cin1core(a); return a; }
template<class... Args> tuple<Args...> cins(){ return cin1<tuple<Args...>>(); }


template<long long MOD> struct mll_{
  using Int = long long;
  using ll = long long;
  ll val_=0;
  /*---- utility ----*/
  mll_ &norm(){ return normR().normS(); }//正規化
  mll_ &normR(){ val_%=MOD; return *this; }//剰余正規化のみ
  mll_ &normS(){ if (val_<0) val_+=MOD; return *this; }//正負正規化のみ
  mll_ &normP(){ if (val_>=MOD) val_-=MOD; return *this; }//加算時正規化
  mll_ &invsg(){ val_=-val_; return normS(); }//正負反転
  ll modinv(int a){//a^-1 mod MOD
    int ypre=0,y=1,apre=MOD;
    while (a>1){
      int t=apre/a;
      apre-=a*t,swap(a,apre);
      ypre-=y*t,swap(y,ypre);
    }
    return y<0 ? y+MOD: y;
  }
  /*---- I/F ----*/
  mll_(){}
  mll_(ll v): val_(v){ norm(); }
  mll_(ll v,bool b): val_(v){} //正規化無のコンストラクタ
  Int val()const{ return (Int)val_; }
  bool isnone() const { return val_==-1; } //true:値なし
  mll_ &none() { val_=-1; return *this; } //値なしにする
  mll_ &inv(){ val_=modinv((int)val_); return *this; }
  mll_ &operator+=(mll_ b){ val_+=b.val_; return normP(); }
  mll_ &operator-=(mll_ b){ val_-=b.val_; return normS(); }
  mll_ &operator*=(mll_ b){ val_*=b.val_; return normR(); }
  mll_ &operator/=(mll_ b){ return *this*=b.inv(); }
  mll_ &operator+=(ll b){ return *this+=mll_(b); }
  mll_ &operator-=(ll b){ return *this-=mll_(b); }
  mll_ &operator*=(ll b){ return *this*=mll_(b); }
  mll_ &operator/=(ll b){ return *this/=mll_(b); }
  mll_ operator-()const{ return mll_(*this).invsg(); }
  mll_ operator+(mll_ b)const{ return mll_(*this)+=b; }
  mll_ operator-(mll_ b)const{ return mll_(*this)-=b; }
  mll_ operator*(mll_ b)const{ return mll_(*this)*=b; }
  mll_ operator/(mll_ b)const{ return mll_(*this)/=b; }
  mll_ operator+(ll b)const{ return mll_(*this)+=b; }
  mll_ operator-(ll b)const{ return mll_(*this)-=b; }
  mll_ operator*(ll b)const{ return mll_(*this)*=b; }
  mll_ operator/(ll b)const{ return mll_(*this)/=b; }
  friend mll_ operator+(ll a,mll_ b){ return b+a; }
  friend mll_ operator-(ll a,mll_ b){ return -b+a; }
  friend mll_ operator*(ll a,mll_ b){ return b*a; }
  friend mll_ operator/(ll a,mll_ b){ return mll_(a)/b; }
  bool operator==(mll_ b)const{ return val_==b.val_; }
  bool operator!=(mll_ b)const{ return val_!=b.val_; }
  bool operator==(ll b)const{ return *this==mll_(b); }
  bool operator!=(ll b)const{ return *this!=mll_(b); }
  friend bool operator==(ll a,mll_ b){ return mll_(a)==b; }
  friend bool operator!=(ll a,mll_ b){ return mll_(a)!=b; }
  friend ostream &operator<<(ostream &os,mll_  a){ return os << a.val_; }
  friend istream &operator>>(istream &is,mll_ &a){ return is >> a.val_; }
  mll_ pow(ll k)const{
    mll_ ret(1,false),a(*this);
    for (; k>0; k>>=1,a*=a) if (k&1)ret*=a;
    return ret;
  }
  static constexpr int mod() { return MOD; }
  //enum{ modll=MOD };
};


struct bll{ //第0～62bitまで対応
  ll s=0;
  bll(ll s_=0): s(s_){}
  bll(int s_): s(s_){}
  bll(const string &bitstr): s(str2val(bitstr)){}
  bll(const char *bitstr): s(str2val(bitstr)){}
  struct ref {
    bll &b; const ll msk;
    ref(bll &b_,ll pos):b(b_),msk(1LL<<pos){}
    operator ll() const { return (b.s&msk)!=0; }
    ref &operator=(bool x){ if(x) b.s|=msk; else b.s&=~msk; return *this; }
  };
  ref operator[](ll pos){ return ref(*this,pos); }
  ll operator[](ll pos) const { return (s>>pos)&1; }
  bll &operator=(int b){ s=b; return *this; }
  bll &operator=(ll b){ s=b; return *this; }
  bll &operator=(const string &bitstr){ s=str2val(bitstr); return *this; }
  bll &operator=(const char *bitstr){ s=str2val(bitstr); return *this; }
  bll operator++(int){ bll b(*this); s++; return b; }
  bll operator--(int){ bll b(*this); s--; return b; }
  operator ll() const noexcept { return s; }
  bll &operator&=(ll b){ s&=b; return *this; }
  bll &operator|=(ll b){ s|=b; return *this; }
  bll &operator^=(ll b){ s^=b; return *this; }
  bll &operator+=(ll b){ s+=b; return *this; }
  bll &operator-=(ll b){ s-=b; return *this; }
  bll &operator<<=(ll i){ s<<=i; return *this; }
  bll &operator>>=(ll i){ s>>=i; return *this; }
  bool contains(ll b)const{ return (s&b)==b; }
  bll &oneq  (ll l,ll r){ s|= rangemask(l,r); return *this; }//l>=r
  bll &offeq (ll l,ll r){ s&=~rangemask(l,r); return *this; }//l>=r
  bll &flipeq(ll l,ll r){ s^= rangemask(l,r); return *this; }//l>=r
  bll &oneq  (ll i){ s|= (1LL<<i); return *this; }
  bll &offeq (ll i){ s&=~(1LL<<i); return *this; }
  bll &flipeq(ll i){ s^= (1LL<<i); return *this; }
  bll on  (ll l,ll r)const{ return bll(s).oneq  (l,r); }//l>=r
  bll off (ll l,ll r)const{ return bll(s).offeq (l,r); }//l>=r
  bll flip(ll l,ll r)const{ return bll(s).flipeq(l,r); }//l>=r
  bll on  (ll i)const{ return bll(s).oneq  (i); }
  bll off (ll i)const{ return bll(s).offeq (i); }
  bll flip(ll i)const{ return bll(s).flipeq(i); }
  bll substr(ll l,ll r)const{ return (s&rangemask(l,r))>>r; }//l>=r
  static ll rangemask(ll l,ll r){ return (1LL<<(l+1))-(1LL<<r); }//l>=r
  ll msbit()const{
    for(ll o=63,x=-1;;){
      ll m=(o+x)/2;
      if(s < (1LL<<m)) o=m; else x=m;
      if(o-x==1) return x;
    }
  }
  ll lsbit()const{ return bll(lsb()).msbit(); }
  ll msb()const{ ll pos=msbit(); return (pos<0) ? 0LL : 1LL<<pos; }
  ll lsb()const{ return s&-s; }
  ll count()const{ return bitset<64>(s).count(); }
  vector<ll> idxes()const{
    vector<ll> v;
    for(ll i=0,t=s; t; t>>=1,i++) if(t&1)v.push_back(i);
    return v;
  }
  string to_string()const{
    string ret;
    for(ll i=msbit();i>=0;--i) ret += '0'+char((s>>i)&1);
    return ret;
  }
private:
  ll str2val(const string &bitstr){
    ll val=0, len=(ll)bitstr.size();
    for(ll i=0;i<len;++i) val|=ll(bitstr[i]-'0')<<(len-1-i);
    return val;
  }
};


template<class T> struct SET: set<T>{
  using P=set<T>;
  typename P::iterator it=P::end();
  template<class...Args> SET(Args...args): P(args...){}
  SET(initializer_list<T> a): P(a.begin(),a.end()){}
  ll size() const { return (ll)P::size(); }
  bool insert(const T &x){ bool r; tie(it,r)=P::insert(x); return r; }
  template <class It> void insert(It st,It en){ P::insert(st,en); }
  void insert(initializer_list<T> a){ P::insert(a.begin(),a.end()); }
  template<class...A> bool emplace(A&&...a){ bool r; tie(it,r)=P::emplace(a...); return r; }
  void eraseit(){ it=P::erase(it); }
  void find(const T &x){ it=P::find(x); }
  bool contains(const T &x){ return P::count(x)==1; }
  void lower_bound(const T &x){ it=P::lower_bound(x); }
  void upper_bound(const T &x){ it=P::upper_bound(x); }
  bool isend() { return it==P::end(); }
  T getit() { return *it; }
  T next() { return *(++it); }
  T prev() { return *(--it); }
  bool nextok() { return !isend() && it!=--P::end(); }
  bool prevok() { return it!=P::begin(); }
  T front() { return *(it=P::begin()); }
  T back()  { return *(it=--P::end()); }
  void pop_front(){ front(); eraseit(); }
  void pop_back(){ back(); eraseit(); }
  void push_front(const T &x){ it=P::insert(P::begin(),x); }
  void push_back (const T &x){ it=P::insert(P::end(),x); }
  void push_out(SET &b){ b.push_front(back()); pop_back(); }
  void pull_in(SET &b){ push_back(b.front()); b.pop_front(); }
};


template<class T> struct cumulativesum{
  using Int = long long;
  using ll = long long;
  ll n=0;  vector<T> c;
  cumulativesum():c(1){}
  template<class S> cumulativesum(S &&v): n((ll)v.size()),c(n+1) { Ini(v); }
  template<class S> void init(S &&v){ n=(ll)v.size(); c.resize(n+1); Ini(v); }
  void add(T x) { n++; c.push_back(c.back()+x); }
  T operator()(Int l,Int r){ return c[max(min(n,r+1),0LL)]-c[min(max(0LL,l),n)]; }
  pair<Int,T> group(T i){
    ll g=upper_bound(c.begin(),c.end(),i)-c.begin()-1;
    T r = g>=0 ? i-c[g] : i;
    return {g,r};
  }
  T mx(){//区間和max
    T mn=T(),samx=0;
    for(ll i=1;i<=n;++i){
      chmax(samx,c[i]-mn);
      chmin(mn,c[i]);
    }
    return samx;
  }
  template<class S> void Ini(S &&v) { for(ll i=0;i<n;++i) c[i+1]=c[i]+v[i]; }
};
template<class S> cumulativesum(S) -> cumulativesum<typename remove_reference<S>::type::value_type>;


template<class T> vector<T> powers(T m,ll n){
  vector<T> ret(n+1,1);
  for(ll i=1;i<=n;++i) ret[i]=ret[i-1]*m;
  return ret;
}


template <class T> auto runlength(T &&v){
  vector<pair<typename remove_reference<T>::type::value_type,ll>> ret;
  for(auto&&e:v){
    if(ret.empty() or ret.back().first!=e) ret.emplace_back(e,1);
    else ret.back().second++;
  }
  return ret;
}


inline vector<ll> str2num(string &s,char base,const string &etc){
  vector<ll>  v(s.size());
  for(ll i=0;i<(ll)s.size();++i){
    size_t pos=etc.find(s[i]);
    if(pos==etc.npos) v[i]=s[i]-(ll)base;
    else v[i]=-((ll)pos+1);
  }
  return v;
}


template<class T> struct combination{
  vector<T> f,g; ll mxN=0;
  combination(){}
  combination(ll maxN): f(maxN+1,1),g(maxN+1),mxN(maxN) {
    for (ll i=1;i<=mxN;++i) { f[i]=f[i-1]*i; }
    g[mxN]=1/f[mxN];
    for (ll i=mxN;i>=1;--i) { g[i-1]=g[i]*i; }
  }
  T P(ll n,ll r){ return (n<0 || r<0 || n<r) ? T(0) : f[n]*g[n-r]; } //nPr
  T H(ll n,ll r){ return operator()(n+r-1,n-1); }//nHr
  T inv(ll n) { return f[n-1] * g[n]; } //1/n
  T fact(ll n) { return f[n]; } //n!
  T finv(ll n) { return g[n]; } //1/n!
  T operator()(ll n,ll r){
    if (r<0) return 0;
    if (n<0) return operator()(-n+r-1,r) * ((r&1)?-1:1); //-nＣr = (-1)^r * n+r-1Ｃr
    if (n<r) return 0;
    if (n<=mxN) return f[n]*g[n-r]*g[r]; //通常
    //n巨大、rかn-r小
    if (n-r<r) r=n-r;
    T bunsi=1,bunbo=1;
    for (ll i=0;i<r;++i) bunsi*=n-i;
    for (ll i=0;i<r;++i) bunbo*=i+1;
    return bunsi/bunbo;
  }
  template<class SP>
  vector<T> CnLnR(long long nL,long long nR,long long r,SP sp){
    if (nR-nL+1<=0) return vector<T>();
    if (r<0) return vector<T>(nR-nL+1,0);
    vector<T> v=sp(nL-r+1,nR-r+1,r);
    for (T& e: v) e*=finv(r);
    return v;
  }
  template<class SP>
  vector<T> HrLrR(long long n,long long rL,long long rR,SP sp){//r<0不可
    return CnLnR(n-1+rL,n-1+rR,n-1,sp);
  }
};


template<class T> struct wrapVector1d{
  using S=typename T::value_type;
  using Int = long long;
  const T *v;
  S Ini;
  wrapVector1d(const T &v_,S ini_=S()):v(&v_),Ini(ini_){}
  S operator[](Int i)const{ return (i<0 || (Int)v->size()<=i) ? Ini : (*v)[i]; }
};
template<class T> struct wrapVector2d{
  using S=typename T::value_type;
  using Int = long long;
  const vector<T> *v;
  S Ini;
  T dmy;
  wrapVector2d(const vector<T> &v_,S ini_=S()):v(&v_),Ini(ini_){}
  wrapVector1d<T> operator[](ll i)const{
    return (i<0 || (Int)v->size()<=i) ?
      wrapVector1d(dmy,Ini) : wrapVector1d((*v)[i],Ini);
  }
};


namespace dumpstring{//dummy
struct args{
  using Int = long long;
  args(){}
  args &wd(Int wd__){ (void)wd__; return *this; }
  template<size_t DIM> args &rngs(array<array<Int,DIM>,2> rngs){ return *this; }
  args &tr(vector<Int> tr__){ (void)tr__; return *this; }
  args &tr(){ return *this; }
  args &labels(vector<string> labels__){ (void)labels__; return *this; }
  args &xrev(){ return *this; }
  args &yrev(){ return *this; }
  args &zrev(){ return *this; }
  args &wrev(){ return *this; }
};
template<class NdT>
void dumpNd(const string &h,const NdT &fd,const args &p=args(),ostream &os=cerr){}
};
using dumpstring::args; using dumpstring::dumpNd;

#endif//テンプレートend


template<class T> struct Vector: vector<T>{
  using Int = long long;
  using vT=vector<T>;
  using cvT=const vector<T>;
  using cT=const T;
  using vT::vT; //親クラスのコンストラクタの隠蔽を回避
  using vT::begin,vT::end,vT::insert,vT::erase;
  auto it(Int i){ return begin()+i; }
  auto it(Int i)const{ return begin()+i; }
  Vector(cvT& b):vT(b){}
  Vector(vT&& b):vT(move(b)){}
  template<class S> Vector(const Vector<S>& b):vT(b.begin(),b.end()){}
  template<class S> Vector(const vector<S>& b):vT(b.begin(),b.end()){}
  Vector(Int n,T s,T d){ iota(n,s,d); }
  Vector(Int n,function<T(Int)> g):vT(n){ for(Int i=0;i<n;++i) (*this)[i]=g(i); }
  template<class S> Vector &operator+=(S x){ for(T &e: *this) e+=x;  return *this; }
  template<class S> Vector &operator-=(S x){ for(T &e: *this) e-=x;  return *this; }
  template<class S> Vector &operator*=(S x){ for(T &e: *this) e*=x;  return *this; }
  template<class S> Vector &operator/=(S x){ for(T &e: *this) e/=x;  return *this; }
  template<class S> Vector &operator%=(S x){ for(T &e: *this) e%=x;  return *this; }
  template<class S> Vector operator+(S x)const{ return Vector(*this)+=x; }
  template<class S> Vector operator-(S x)const{ return Vector(*this)-=x; }
  template<class S> Vector operator*(S x)const{ return Vector(*this)*=x; }
  template<class S> Vector operator/(S x)const{ return Vector(*this)/=x; }
  template<class S> Vector operator%(S x)const{ return Vector(*this)%=x; }
  Vector &operator--(int){ return *this-=T(1); }
  Vector &operator++(int){ return *this+=T(1); }
  Vector operator-()const{ return Vector(*this)*=-1; }
  template<class S> friend Vector operator-(S x,const Vector &a){ return -a+=x; }
  Vector slice(Int l,Int r,Int d=1)const{
    Vector ret;
    for(Int i=l;(d>0&&i<=r)||(d<0&&r<=i);i+=d) ret.push_back((*this)[i]);
    return ret;
  }
  Int size()const{ return (Int)vT::size(); }
  Vector &push_back(cT& x,Int n=1){ for(Int i=0;i<n;++i){ vT::push_back(x); } return *this; }
  Vector &pop_back(Int n=1){ for(Int i=0;i<n;++i){ vT::pop_back(); } return *this; }
  Vector &push_front(cT& x,Int n=1){ this->insert(0,x,n); return *this; }
  Vector &pop_front(Int n=1){ erase(0,n-1); return *this; }
  T pull_back(){ T x=move(vT::back()); vT::pop_back(); return x; }
  T pull_front(){ T x=move(vT::front()); erase(0); return x; }
  Vector &insert(Int i,cT& x,Int n=1){ insert(it(i),n,x); return *this; }
  Vector &insert(Int i,cvT& b){ insert(it(i),b.begin(),b.end()); return *this; }
  Vector &erase(Int i){ erase(it(i)); return *this; }
  Vector &erase(Int l,Int r){ erase(it(l),it(r+1)); return *this; }
  Vector &concat(cvT &b,Int n=1){
    cvT B = (&b==this) ? *this : vT{};
    for(int i=0;i<n;++i) this->insert(size(),(&b==this)?B:b);
    return *this;
  }
  Vector repeat(Int n){ return Vector{}.concat(*this,n); }
  Vector &reverse(Int l=0,Int r=-1){ r+=r<0?size():0; std::reverse(it(l),it(r+1)); return *this; }
  Vector &rotate(Int m){ return rotate(0,size()-1,m); }
  Vector &rotate(Int l,Int r,Int m){ std::rotate(it(l),it(m),it(r+1)); return *this; }
  Vector &sort(Int l=0,Int r=-1){ r+=r<0?size():0; std::sort(it(l),it(r+1)); return *this; }
  Vector &rsort(Int l=0,Int r=-1){ return sort(l,r).reverse(l,r); }
  template<class Pr> Vector &sort(Pr pr){ return sort(0,size()-1,pr); }
  template<class Pr> Vector &sort(Int l,Int r,Pr pr){ std::sort(it(l),it(r+1),pr); return *this; }
  Vector &uniq(){ erase(unique(begin(),end()),end()); return *this; }
  Vector &sortq(){ return sort().uniq(); }
  Vector &fill(cT& x){ return fill(0,size()-1,x); }
  Vector &fill(Int l,Int r,cT& x){ std::fill(it(l),it(r+1),x); return *this; }
  template<class S=Int> Vector &iota(Int n,T s=0,S d=1){
    vT::resize(n);
    if(n==0) return *this;
    (*this)[0]=s;
    for(int i=1;i<n;++i) (*this)[i]=(*this)[i-1]+d;
    return *this;
  }
  Int count(cT& x)const{ return count(0,size()-1,x); }
  Int count(Int l,Int r,cT& x)const{ return Int(std::count(it(l),it(r+1),x)); }
  template<class Pr> Int countif(Pr pr)const{ return countif(0,size()-1,pr); }
  template<class Pr> Int countif(Int l,Int r,Pr pr)const{ return Int(count_if(it(l),it(r+1),pr)); }
  Int find(cT& x)const{ return find(0,size()-1,x); }
  Int find(Int l,Int r,cT& x)const{ return Int(std::find(it(l),it(r+1),x)-begin()); }
  template<class Pr> Int findif(Pr pr)const{ return findif(0,size()-1,pr); }
  template<class Pr> Int findif(Int l,Int r,Pr pr)const{ return Int(find_if(it(l),it(r+1),pr)-begin()); }
  Vector<Int> findall(cT& x)const{ return findall(0,size()-1,x); }
  Vector<Int> findall(Int l,Int r,cT& x)const{ return findallif(l,r,[&](cT& y){return y==x;}); }
  template<class Pr> Vector<Int> findallif(Pr pr)const{ return findallif(0,size()-1,pr); }
  template<class Pr> Vector<Int> findallif(Int l,Int r,Pr pr)const{
    Vector<Int> ret;
    for(Int i=l;i<=r;++i) if(pr((*this)[i])) ret.push_back(i);
    return ret;
  }
  Int  flooridx(cT& x)const{ return Int(upper_bound(begin(),end(),x)-begin()-1); }
  Int   ceilidx(cT& x)const{ return Int(lower_bound(begin(),end(),x)-begin()); }
  Int  leftnmof(cT& x)const{ return flooridx(x)+1; }
  Int rightnmof(cT& x)const{ return size()-ceilidx(x); }
  bool contains(cT& x)const{ Int i=flooridx(x); return i>=0 && (*this)[i]==x; }
  template<class Pr> Int  flooridx(cT& x,Pr pr)const{ return Int(upper_bound(begin(),end(),x,pr)-begin()-1); }
  template<class Pr> Int   ceilidx(cT& x,Pr pr)const{ return Int(lower_bound(begin(),end(),x,pr)-begin()); }
  template<class Pr> Int  leftnmof(cT& x,Pr pr)const{ return flooridx(x,pr)+1; }
  template<class Pr> Int rightnmof(cT& x,Pr pr)const{ return size()-ceilidx(x,pr); }
  template<class Pr> bool contains(cT& x,Pr pr)const{ Int i=flooridx(x,pr); return i>=0 && (*this)[i]==x; }

  template<class S> using VV    = Vector<Vector<S>>; template<class S> using sVV    = vector<vector<S>>;
  template<class S> using VVV   = Vector<VV<S>>;     template<class S> using sVVV   = vector<sVV<S>>;
  template<class S> using VVVV  = Vector<VVV<S>>;    template<class S> using sVVVV  = vector<sVVV<S>>;
  template<class S> using VVVVV = Vector<VVVV<S>>;   template<class S> using sVVVVV = vector<sVVVV<S>>;
  auto tostd()const{ return tov(*this); }
  template <class S> static vector<S> tov(const Vector<S>&v){ return v; }
  template <class S> static sVV<S>    tov(const VV<S>    &v){ sVV<S>    ret; for(auto&& e:v) ret.push_back(e);         return ret; }
  template <class S> static sVVV<S>   tov(const VVV<S>   &v){ sVVV<S>   ret; for(auto&& e:v) ret.push_back(e.tostd()); return ret; }
  template <class S> static sVVVV<S>  tov(const VVVV<S>  &v){ sVVVV<S>  ret; for(auto&& e:v) ret.push_back(e.tostd()); return ret; }
  template <class S> static sVVVVV<S> tov(const VVVVV<S> &v){ sVVVVV<S> ret; for(auto&& e:v) ret.push_back(e.tostd()); return ret; }
};
/*
vll a={9,8,7},b={1,2,3};
vpll p={{5,3},{7,8},{0,2},};
- -------- 操作系 --------
a+=x a-=x a*=x a/=x a%=x a+x a-x a*x a/x a%x -a x-a a++ a--  //∀i a[i]にxを演算
a.push_front(x,n); //n個先頭追加 省略時1
a.push_back(x,n);  //n個末尾追加 省略時1
a.pop_front(n);    //n個先頭削除 省略時1
a.pop_back(n);     //n個末尾削除 省略時1
ll x=a.pull_front(); //pop_front()と同時に値取得
ll x=a.pull_back();  //pop_back()と同時に値取得
a.insert(i,x,n); //a[i]にn個x挿入  n省略時1
a.insert(i,b);   //a[i]にvll b挿入
a.erase(i);      //a[i]削除
a.erase(l,r);    //区間[l,r]削除
a.concat(b);     //aにbを結合 b=a可
a.concat(b,n);   //aにbをn回結合 b=a可
a.reverse(l,r);  //[l,r]を反転       l,r省略可
a.rotate(m);     //a[m]を先頭にするrotate
a.rotate(l,r,m); //a[m]を先頭にするrotate 範囲[l,r]
a.sort(l,r);     //[l,r]をソート     l,r省略可
a.rsort(l,r);    //[l,r]を逆順ソート l,r省略可
p.sort(l,r,[&](pll x,pll y){return x.second<y.second;});//比較関数指定sort l,r省略可
a.uniq();      //連続同値を1つにする
a.sortq();     //ソートしてユニーク
a.fill(l,r,x); //[l,r]にx代入        l,r省略可
a.iota(n,s,d); //aを等差数列にする 長さn,初項s,公差d
vll a(n,s,d);  //コンストラクタ版iota
vll b=a.slice(st,en,d); //a[st:en:d]   d省略時1
vll b=a.repeat(n);   //aをn回繰り返す
- -------- 検索系 --------
auto pr=[&](auto &x){ return x>0; };  //検索条件
ll m=a.count(x);     //xの個数
ll m=a.count(l,r,x); //xの個数in[l,r]
ll m=a.countif(pr);     //条件満たす個数
ll m=a.countif(l,r,pr); //条件満たす個数in[l,r]
ll i=a.find(x);         //xの最左位置i         ない時N(配列長)
ll i=a.find(l,r,x);     //xの最左位置i in[l,r] ない時r+1
ll i=a.findif(pr);      //条件満たす最左位置i         ない時N(配列長)
ll i=a.findif(l,r,pr);  //条件満たす最左位置i in[l,r] ない時r+1
vll is=a.findall(x);        //xの位置i列挙
vll is=a.findall(l,r,x);    //xの位置i列挙in[l,r]
vll is=a.findallif(pr);     //条件満たす位置i列挙
vll is=a.findallif(l,r,pr); //条件満たす位置i列挙in[l,r]
- -------- 昇順sort済み配列用 --------
ll i=a.flooridx(x);   //x以下の最近傍位置i ない時-1
ll i=a.ceilidx(x);    //x以上の最近傍位置i ない時N(配列長)
ll m=a.leftnmof(x);   //x以下の個数
ll m=a.rightnmof(x);  //x以上の個数
bool b=a.contains(x); //xを含む
- -------- 比較関数prでsort済みの配列用 --------
auto pr=[&](auto &x,auto &y){ return x>y; }; //降順ソート時
ll i=a.flooridx(x,pr);   //x以左の最近傍位置i ない時-1
ll i=a.ceilidx(x,pr);    //x以右の最近傍位置i ない時N(配列長)
ll m=a.leftnmof(x,pr);   //x以左の個数
ll m=a.rightnmof(x,pr);  //x以右の個数
bool b=a.contains(x,pr); //xを含む

a.concat(b,n).pop_back().rsort().uniq();  //連続適用できる
auto aa=a.tostd(); //N次元VectorをN次元vectorに変換(N≦5)
*/


struct fraction{
  ll bunsi=0,bunbo=1;
  /*---- utilty ----*/
  fraction &norm(){//正規化(約分,分母正)
    ll g=gcd(bunsi,bunbo);
    bunsi/=g,bunbo/=g;
    if(bunbo<0) bunsi*=-1,bunbo*=-1;
    return *this;
  }
  fraction &invsg(){//正負反転
    bunsi*=-1;
    return *this;
  }
  /*---- I/F ----*/
  fraction(){}
  fraction(ll bunsi_,ll bunbo_):bunsi(bunsi_),bunbo(bunbo_){
    norm();
  }
  fraction(ll b):bunsi(b){}//整数用コンストラクタ
  fraction(ll bunsi_,ll bunbo_,bool)//正規化無のコンストラクタ
    :bunsi(bunsi_),bunbo(bunbo_){}

  fraction &operator+=(fraction b){
    ll bo=bunbo*b.bunbo;
    ll si=bunsi*b.bunbo + b.bunsi*bunbo;
    bunsi=si,bunbo=bo;
    return norm();
  }
  fraction &operator-=(fraction b){
    return (*this)+=b.invsg();
  }
  fraction &operator*=(fraction b){
    bunsi*=b.bunsi;
    bunbo*=b.bunbo;
    return norm();
  }
  fraction &operator/=(fraction b){
    return (*this)*=b.inv();
  }
  fraction &operator+=(ll b){ bunsi+=bunbo*b; return *this; }
  fraction &operator-=(ll b){ return (*this)+=-b; }
  fraction &operator*=(ll b){ bunsi*=b; return norm(); }
  fraction &operator/=(ll b){ bunbo*=b; return norm(); }
  fraction operator-()const{ return {-bunsi,bunbo,0}; }
  fraction operator+(const fraction &b)const{ return fraction(*this)+=b; }
  fraction operator-(const fraction &b)const{ return fraction(*this)-=b; }
  fraction operator*(const fraction &b)const{ return fraction(*this)*=b; }
  fraction operator/(const fraction &b)const{ return fraction(*this)/=b; }
  fraction operator+(ll b)const{ return fraction(*this)+=b; }
  fraction operator-(ll b)const{ return fraction(*this)-=b; }
  fraction operator*(ll b)const{ return fraction(*this)*=b; }
  fraction operator/(ll b)const{ return fraction(*this)/=b; }
  friend fraction operator+(ll a,const fraction &b){ return b+a; }
  friend fraction operator-(ll a,const fraction &b){ return -b+a; }
  friend fraction operator*(ll a,const fraction &b){ return b*a; }
  friend fraction operator/(ll a,const fraction &b){ return b.inv()*a; }
  bool operator==(const fraction &b)const{
    return bunsi==b.bunsi && bunbo==b.bunbo;
  }
  bool operator!=(const fraction &b)const{ return !(*this==b); }
  bool operator<(const fraction &b)const{
    return (b-*this).bunsi>0;
  }
  bool operator>(const fraction &b)const{ return b<*this; }
  bool operator>=(const fraction &b)const{ return !(*this<b); }
  bool operator<=(const fraction &b)const{ return b>=*this; }
  friend ostream &operator << (ostream &os,const fraction &a){
    return os<<a.bunsi<<'/'<<a.bunbo;
  }
  string to_string()const{ return std::to_string(bunsi)+'/'+std::to_string(bunbo); }
  fraction inv()const{
    if(bunsi<0) return {-bunbo,-bunsi,0};
    else         return {bunbo, bunsi,0};
  }
};
/*
- 定義   ↓b分のa (a/b)
fraction x(a,b);
.        ↓整数a
fraction x(a);
.        ↓正規化無(約分と分母正化なしで良い時)
fraction x(a,b,true);
fraction y=x.inv(); 逆数
x+y,x-y,x*y,x/y,-x,  x+=y,x-=y,x*=y,x/=y,  x==y,x!=y,x<y,x>y,x<=y,x>=y
cout << x; //"a/b"と表示
*/

#if 0
#define MODLL (1000000007LL)
#else
#define MODLL (998244353LL)
#endif
using mll = mll_<MODLL>;
//using mll = fraction;

//　１
//０┼２
//　３              左     上     右    下
vector<pll> dxys={{0,-1},{-1,0},{0,1},{1,0},};


namespace SolvingSpace{

template<class T> using vector = Vector<T>;
using    vll=vector<   ll>; using    vmll=vector<   mll>; using    vdd=vector<   dd>;
using   vvll=vector<  vll>; using   vvmll=vector<  vmll>; using   vvdd=vector<  vdd>;
using  vvvll=vector< vvll>; using  vvvmll=vector< vvmll>; using  vvvdd=vector< vvdd>;
using vvvvll=vector<vvvll>; using vvvvmll=vector<vvvmll>; using vvvvdd=vector<vvvdd>;
using   vpll=vector<  pll>; using    vtll=vector<   tll>; using   vqll=vector<  qll>;
using  vvpll=vector< vpll>; using   vvtll=vector<  vtll>; using  vvqll=vector< vqll>;
using   vll2=vector<  ll2>; using    vll3=vector<   ll3>; using   vll4=vector<  ll4>;
using  vvll2=vector< vll2>; using   vvll3=vector<  vll3>; using  vvll4=vector< vll4>;
using vvvll2=vector<vvll2>; using  vvvll3=vector< vvll3>; using vvvll4=vector<vvll4>;
using vss=vector<string>;
template<class T> vector<T> cinv(ll nm){ return vector<T>(nm,[](ll i){ (void)i; return cin1<T>(); }); }
template<class T> vector<vector<T>> cinvv(ll H,ll W){ return vector<vector<T>>(H,[&](ll i){ (void)i; return cinv<T>(W); }); }


struct coordinateCompression{
  using Int = long long;
  vector<Int> idx2val;
  coordinateCompression(){}
  coordinateCompression(vector<Int> &vs){ add(vs),compress(),v2i(vs); }
  void add(Int val){ idx2val.push_back(val); }
  void add(const vector<Int> &vs){ for(auto&& e:vs) idx2val.push_back(e); }
  void compress(){
    sort(idx2val.begin(),idx2val.end());
    idx2val.erase(unique(idx2val.begin(),idx2val.end()),idx2val.end());
  }
  Int size(){ return (Int)idx2val.size(); }
  Int i2v(Int i){ return idx2val[i]; }
  Int v2i(Int v){
    return lower_bound(idx2val.begin(),idx2val.end(),v)-idx2val.begin();
  }
  void v2i(vector<Int> &vs){ for(auto&& e: vs) e=v2i(e); }//vsを置換え
  Int v2flooridx(Int v){
    return upper_bound(idx2val.begin(),idx2val.end(),v)-idx2val.begin()-1;
  }
  Int v2ceilidx(Int v){
    return lower_bound(idx2val.begin(),idx2val.end(),v)-idx2val.begin();
  }
  bool contains(Int v){
    auto it=lower_bound(idx2val.begin(),idx2val.end(),v);
    return it!=idx2val.end() && *it==v;
  }
};
/*
coordinateCompression co;
coordinateCompression co(vs);
.                        ↑vsを追加&圧縮&置換
- -------- データ追加 --------   1要素でも、vector丸ごとでも可
co.add(x);
co.add(vs);
- -------- 圧縮 --------
co.compress();
- -------- 利用 --------
ll m=co.size(); //圧縮後のデータ数
ll x=co.i2v(i);        //圧縮後iの圧縮前の値x
ll i=co.v2i(x);        //圧縮前xの圧縮後の値i
co.v2i(vs);       //vsの全vをiに置換
ll i=co.v2flooridx(x); //        〃       (ぴったりxがなければ小さい方)
ll i=co.v2ceilidx(x);  //        〃       (ぴったりxがなければ大きい方)
bool b=co.contains(x); //true:xが圧縮前データに含まれる
*/


template <class T> struct BIT_{
  vector<T> v; ll N;
  BIT_(){}
  BIT_(ll N) { init(N); }
  void init(ll N) { v.resize(N+1); this->N = N; }
  void add(ll i,T x) { for(i++; i<=N; i+=i&(-i)) v[i]+=x; }
  T sum(ll i) { if(i>=N)i=N-1; T s=0;  for(i++; i>0; i-=i&(-i)) s+=v[i];  return s; }
  T sum(ll i,ll j) { return sum(j)-sum(i-1); }
  T sum() { return sum(N-1); } //総和
  T operator[](ll i) { return sum(i,i); }
  ll lower_bound(T s){
    ll i=0,l=1;  while(l<N) l<<=1;
    for(; l>0; l>>=1) if(i+l<=N && v[i+l]<s) s-=v[i+=l];
    return i;
  }
  void Dump() { rep(i,0,N-1) cerr<<setw(3)<< i <<" "<<setw(5)<< sum(i,i) <<'\n'; }
  /*---- 集合管理用I/F ----*/
  ll size() { return sum(); } //要素数
  void insert(ll x) { add(x,1); }//集合にx追加
  void erase(ll x) { add(x,-1); }//集合からx1つ削除
  bool contains(ll x) { return (0<=x&&x<N) ? (*this)[x]>=1 : false; }//x∈集合ならtrue
  ll rank(ll x) { return sum(x-1)+1; }//xが小さい方から何番目か 1-origin
  ll rrank(ll x) { return sum(x+1,N-1)+1; }//xが大きい方から何番目か 1-origin
  ll leftnumof(ll x) { return sum(x); }//x以下の個数
  ll rightnumof(ll x) { return sum(x,N-1); }//x以上の個数
  ll nthsmall(ll r) { return lower_bound(r); } //r番目に小さい要素 1-origin
  ll nthbig(ll r) { return (size()<r) ? -1 : nthsmall(size()+1-r); }
                         //r番目に大きい要素 1-origin
  /*---- 動的imos用I/F ----*/
  void rangeadd(ll l,ll r,T x){ add(l,x),add(r+1,-x); }//[l,r]にx加算
  T imos(ll i){ return sum(i); }//加算後の第i要素
};
using BIT = BIT_<ll>;
/*
BIT bit(n); //準備 0~n-1
ll nm=bit.size(); //集合の要素数
bit.insert(x); //集合にxを挿入
bit.erase(x);  //集合からxを1つ削除
bool b=bit.contains(x); //x∈集合ならtrue
ll r = bit.rank(x);  //xが小さい方から何番目か 1-origin
ll r = bit.rrank(x); //xが大きい方から何番目か 1-origin
ll nm=bit.leftnumof(x);  //x以下の個数
ll nm=bit.rightnumof(x); //x以上の個数
ll nm=bit[x];            //xの個数
ll x=bit.nthsmall(r); //r番目に小さい要素 1-origin ない時はN
ll x=bit.nthbig(r);   //r番目に大きい要素 1-origin ない時は-1
--- 動的imos用I/F ---
bit.rangeadd(l,r,x); //区間[l,r]に+x
ll x=bit.imos(i); //第i要素の値
*/



void cin2solve()
{
  auto N=cin1<ll>();
  auto xy=cinv<pair<ll,ll>>(N);

  coordinateCompression cox;
  coordinateCompression coy;
  for(auto&&[x,y]:xy){
    cox.add(x);
    coy.add(y);
  }
  cox.compress();
  coy.compress();
  for(auto&&[x,y]:xy){
    x=cox.v2i(x);
    y=coy.v2i(y);
  }

  xy.sort();
  auto calcP=[](vpll xy){
    ll M=sz(xy);
    BIT bit(M);
    ll ret=0;
    for(auto&&[x,y]:xy){
      ret+=bit.sum(y+1,M-1);
      bit.add(y,1);
    }
    return ret;
  };
  ll Q=calcP(xy);
  for(auto&&[x,y]:xy){
    y=sz(xy)-1-y;
  }
  xy.sort();
  ll P=calcP(xy);
  
  vll xs,ys;
  for(auto&&[x,y]:xy){
    xs.push_back(x);
    ys.push_back(y);
  }
  xs.sort(),ys.sort();
  vector<pair<ll,ll>> xrs=runlength(xs);
  vector<pair<ll,ll>> yrs=runlength(ys);
  ll R=N*(N-1)/2;
  for(auto&&[va,ct]:xrs) R-=ct*(ct-1)/2;
  ll S=N*(N-1)/2;
  for(auto&&[va,ct]:yrs) S-=ct*(ct-1)/2;

  dd ans=(P-Q)/sqrt(R*S);
  cout << ans << '\n';

  return;
}

};//SolvingSpace

//////////////////////////////////////////

int main(){
  #if 1
  //SolvingSpace::labo();
  SolvingSpace::cin2solve();
  //SolvingSpace::generand();
  #else
  ll t;  cin >> t;
  rep(i,0,t-1){
    SolvingSpace::cin2solve();
    //SolvingSpace::generand();
  } 
  #endif
  cerr << timeget() <<"ms"<< '\n';
  return 0;
}
yukicoder

結果

テストケース

ソースコード
