#1025997 (C++23) No.1287 えぬけー

• 問題: No.1287 えぬけー
• ユーザー: eQe
• 提出日時: 2024-11-10 23:54:33
• 言語: C++23 (gcc 12.3.0 + boost 1.83.0)
• 結果: AC
• 実行時間: 188 ms / 2,000 ms
• コード長: 8,939 bytes
• コンパイル時間: 6,539 ms
• コンパイル使用メモリ: 341,636 KB
• 実行使用メモリ: 5,248 KB
• 最終ジャッジ日時: 2024-11-10 23:54:43
• 合計ジャッジ時間: 9,049 ms
• ジャッジサーバーID （参考情報）: judge3 / judge1

入力	結果	実行時間; 実行使用メモリ
testcase_00	AC	1 ms; 5,248 KB
testcase_01	AC	2 ms; 5,248 KB
testcase_02	AC	2 ms; 5,248 KB
testcase_03	AC	1 ms; 5,248 KB
testcase_04	AC	2 ms; 5,248 KB
testcase_05	AC	168 ms; 5,248 KB
testcase_06	AC	188 ms; 5,248 KB
testcase_07	AC	171 ms; 5,248 KB
testcase_08	AC	156 ms; 5,248 KB

ソースコード

#include<bits/stdc++.h>
#include<atcoder/all>
namespace my{
using namespace std;
#define eb emplace_back
#define LL(...) ll __VA_ARGS__;lin(__VA_ARGS__)
#define FO(n) for(ll ij=n;ij--;)
#define FOR(i,...) for(auto[i,i##stop,i##step]=range(0,__VA_ARGS__);i<i##stop;i+=i##step)
#define fo(i,...) FO##__VA_OPT__(R)(i __VA_OPT__(,__VA_ARGS__))
#define of(i,...) for(auto[i,i##stop,i##step]=range(1,__VA_ARGS__);i>=i##stop;i-=i##step)
#define fe(a,i,...) for(auto&&__VA_OPT__([)i __VA_OPT__(,__VA_ARGS__]):a)
#define multiple_testcases void solve();}int main(){my::io();int T;std::cin>>T;while(T--)my::solve();}namespace my{
void io(){cin.tie(nullptr)->sync_with_stdio(0);cout<<fixed<<setprecision(15);}
using ll=long long;
using ull=unsigned long long;
using ulll=__uint128_t;
using lll=__int128_t;
istream&operator>>(istream&i,ulll&x){ull t;i>>t;x=t;return i;}
ostream&operator<<(ostream&o,const ulll&x){return(x<10?o:o<<x/10)<<ll(x%10);}
istream&operator>>(istream&i,lll&x){ll t;i>>t;x=t;return i;}
ostream&operator<<(ostream&o,const lll&x){return o<<string(x<0,'-')<<ulll(x>0?x:-x);}
template<class...A>auto range(bool s,A...a){array<ll,3>r{0,0,1};ll I=0;((r[I++]=a),...);if(!s&&I==1)swap(r[0],r[1]);r[0]-=s;return r;}
constexpr char nl=10;
constexpr char sp=32;
lll pw(lll x,ll n){assert(n>=0);lll r=1;while(n)n&1?r*=x:r,x*=x,n>>=1;return r;}

template<class A,class B>struct pair{
  A a;B b;
  pair()=default;
  pair(A a,B b):a(a),b(b){}
  pair(const std::pair<A,B>&p):a(p.first),b(p.second){}
  auto operator<=>(const pair&)const=default;
  friend ostream&operator<<(ostream&o,const pair&p){return o<<p.a<<sp<<p.b;}
};

template<class F=less<>>auto&sort(auto&a,const F&f={}){ranges::sort(a,f);return a;}

template<class T,class U>ostream&operator<<(ostream&o,const std::pair<T,U>&p){return o<<p.first<<sp<<p.second;}
template<class T,size_t n>ostream&operator<<(ostream&o,const array<T,n>&a){fo(i,n)o<<a[i]<<string(i!=n-1,sp);return o;}
template<class T,class U>ostream&operator<<(ostream&o,const unordered_map<T,U>&m){fe(m,e)o<<e.first<<sp<<e.second<<nl;return o;}

template<class V>concept vectorial=is_base_of_v<vector<typename V::value_type>,V>;
template<class V>istream&operator>>(istream&i,vector<V>&v){fe(v,e)i>>e;return i;}
template<class V>ostream&operator<<(ostream&o,const vector<V>&v){fe(v,e)o<<e<<string(&e!=&v.back(),vectorial<V>?nl:sp);return o;}

template<class V>struct vec:vector<V>{
  using vector<V>::vector;
  vec(const vector<V>&v){vector<V>::operator=(v);}

  vec&operator^=(const vec&u){this->insert(this->end(),u.begin(),u.end());return*this;}
  vec operator^(const vec&u)const{return vec{*this}^=u;}
  vec&operator++(){fe(*this,e)++e;return*this;}
  vec&operator--(){fe(*this,e)--e;return*this;}
};

void lin(auto&...a){(cin>>...>>a);}
template<char c=sp>void pp(const auto&...a){ll n=sizeof...(a);((cout<<a<<string(--n>0,c)),...);cout<<nl;}

template<class T,class U=T>auto rle(const vec<T>&a){vec<pair<T,U>>r;fe(a,e)r.size()&&e==r.back().a?++r.back().b:r.eb(e,1).b;return r;}
template<class T,class U=T>auto rce(vec<T>a){return rle<T,U>(sort(a));}

uint64_t kth_root_floor(uint64_t a,ll k){
  if (k==1)return a;
  auto is_within=[&](uint32_t x){uint64_t t=1;fo(k)if(__builtin_mul_overflow(t,x,&t))return false;return t<=a;};

  uint64_t r=0;
  of(i,sizeof(uint32_t)*CHAR_BIT)if(is_within(r|(1u<<i)))r|=1u<<i;
  return r;
}
auto sqrt_floor(auto x){return kth_root_floor(x,2);}

ll rand(auto...a){array<ll,2>v{};ll I=0;((v[I++]=a),...);auto[l,r]=v;if(I==1)swap(l,r);static ll t=495;t^=t<<7,t^=t>>9;return l<r?(t%(r-l)+(t%(r-l)<0?r-l:0))+l:t;}

struct montgomery64{
  using modular=montgomery64;
  using i64=__int64_t;
  using u64=__uint64_t;
  using u128=__uint128_t;

  static inline u64 N;
  static inline u64 N_inv;
  static inline u64 R2;

  static int set_mod(u64 N){
    if(modular::N==N)return 0;
    assert(N<(1ULL<<63));
    assert(N&1);
    modular::N=N;
    R2=-u128(N)%N;
    N_inv=N;
    fo(5)N_inv*=2-N*N_inv;
    assert(N*N_inv==1);
    return 0;
  }
  static inline int init=set_mod(998244353);

  static u64 mod(){return N;}

  u64 a;
  montgomery64(const i64&a=0):a(reduce((u128)(a%(i64)N+N)*R2)){}

  static u64 reduce(const u128&T){
    u128 r=(T+u128(u64(T)*-N_inv)*N)>>64;
    return r>=N?r-N:r;
  }

  auto&operator+=(const modular&b){if((a+=b.a)>=N)a-=N;return*this;}
  auto&operator-=(const modular&b){if(i64(a-=b.a)<0)a+=N;return*this;}
  auto&operator*=(const modular&b){a=reduce(u128(a)*b.a);return*this;}
  auto&operator/=(const modular&b){*this*=b.inv();return*this;}

  friend auto operator+(const modular&a,const modular&b){return modular{a}+=b;}
  friend auto operator-(const modular&a,const modular&b){return modular{a}-=b;}
  friend auto operator*(const modular&a,const modular&b){return modular{a}*=b;}
  friend auto operator/(const modular&a,const modular&b){return modular{a}/=b;}
  friend bool operator==(const modular&a,const modular&b){return a.a==b.a;}
  auto operator-()const{return modular{}-modular{*this};}

  modular pow(u128 n)const{
    modular r{1},x{*this};
    while(n){
      if(n&1)r*=x;
      x*=x;
      n>>=1;
    }
    return r;
  }

  modular inv()const{u64 a=val(),b=N,u=1,v=0;assert(gcd(a,b)==1);while(b)swap(u-=a/b*v,v),swap(a-=a/b*b,b);return u;}
  u64 val()const{return reduce(a);}

  friend istream&operator>>(istream&i,montgomery64&b){ll t;i>>t;b=t;return i;}
  friend ostream&operator<<(ostream&o,const montgomery64&b){return o<<b.val();}
};

bool miller_rabin(ll n,vec<ll>as){
  ll d=n-1;
  while(~d&1)d>>=1;

  using modular=montgomery64;
  auto pre_mod=modular::mod();
  modular::set_mod(n);

  modular one=1,minus_one=n-1;
  fe(as,a){
    if(a%n==0)continue;
    ll t=d;
    modular y=modular(a).pow(t);
    while(t!=n-1&&y!=one&&y!=minus_one)y*=y,t<<=1;
    if(y!=minus_one&&~t&1)return modular::set_mod(pre_mod),0;
  }
  return modular::set_mod(pre_mod),1;
}

bool is_prime(ll n){
  if(~n&1)return n==2;
  if(n<=1)return 0;
  if(n<4759123141LL)return miller_rabin(n,{2,7,61});
  return miller_rabin(n,{2,325,9375,28178,450775,9780504,1795265022});
}

ll pollard_rho(ll n){
  if(~n&1)return 2;
  if(is_prime(n))return n;

  using modular=montgomery64;
  auto pre_mod=modular::mod();
  modular::set_mod(n);

  modular R,one=1;
  auto f=[&](const modular&x){return x*x+R;};
  while(1){
    modular x,y,ys,q=one;
    R=rand(2,n),y=rand(2,n);
    ll g=1;
    constexpr ll m=128;
    for(ll r=1;g==1;r<<=1){
      x=y;
      fo(r)y=f(y);
      for(ll k=0;g==1&&k<r;k+=m){
        ys=y;
        for(ll i=0;i<m&&i<r-k;++i)q*=x-(y=f(y));
        g=std::gcd(q.val(),n);
      }
    }
    if(g==n)do g=std::gcd((x-(ys=f(ys))).val(),n);while(g==1);
    if(g!=n)return modular::set_mod(pre_mod),g;
  }
}

auto factorize(ll n){
  assert(n>0);
  auto f=[](auto&f,ll m){
    if(m==1)return vec<ll>{};
    ll d=pollard_rho(m);
    return d==m?vec<ll>{d}:f(f,d)^f(f,m/d);
  };
  return rce(f(f,n));
}

template<class T,class U>common_type_t<T,U>gcd(T a,U b){return b?gcd(b,a%b):a>0?a:-a;}
template<class...A>auto gcd(const A&...a){common_type_t<A...>r=0;((r=gcd(r,a)),...);return r;}

auto mod(auto a,auto m){return(a%=m)<0?a+m:a;}
auto inv_mod(auto x,auto m){assert(gcd(x,m)==1);decltype(x)a=mod(x,m),b=m,u=1,v=0;while(b)swap(u-=a/b*v,v),swap(a-=a/b*b,b);return mod(u,m);}

ll kth_root_mod_prime(ll a,ll k,ll P){
  k=mod(k,P-1);
  if(k==0)return(a==1?1:-1);
  if(a==0)return 0;
  if(P==2)return a;

  using modular=montgomery64;
  auto pre_mod=modular::mod();
  modular::set_mod(P);

  ll g=gcd(k,P-1);
  if(modular(a).pow((P-1)/g)!=1)return modular::set_mod(pre_mod),-1;

  g=mod(g,P-1);
  if(g==0)return modular::set_mod(pre_mod),1;
  a=modular(a).pow(inv_mod(k/g,(P-1)/g)).val();

  const modular one=1;
  auto pe_root=[&](modular c,ll p,ll e){
    ll t=0;
    ll s=P-1;
    while(s%p==0)++t,s/=p;

    modular v=one;
    while(v.pow((P-1)/p)==one)v+=one;
    modular vs=v.pow(s);

    ll pe=pw(p,e);
    ll u=inv_mod(-s,pe);
    modular z=c.pow(((lll)s*u+1)/pe);
    modular c_inv=c.inv();

    modular A=vs.pow(pw(p,t-1)),A_inv=A.inv();

    while(1){
      modular zpe_c=z.pow(pe)*c_inv;

      ll t_dash=0;
      modular zpe_c_pow=zpe_c;
      while(zpe_c_pow!=one){
        zpe_c_pow=zpe_c_pow.pow(p);
        ++t_dash;
      }
      if(t_dash==0)break;
      ll E=t-t_dash;

      ll q=-1;
      modular B=zpe_c.inv().pow(pw(p,t_dash-1));

      ll R=sqrt_floor(p)+1;
      unordered_map<ll,int>dict;

      modular A_inv_R=A_inv.pow(R);
      modular A_inv_R_pow=1;
      fo(i,R){
        dict[(B*A_inv_R_pow).val()]=i;
        A_inv_R_pow*=A_inv_R;
      }

      modular A_pow=1;
      fo(j,R){
        if(ll key=A_pow.val();dict.contains(key)){q=R*dict[key]+j;break;}
        A_pow*=A;
      }

      z*=vs.pow(pw(p,E-e)).pow(q);
    }
    return z.val();
  };

  fe(factorize(g),p,e)a=pe_root(a,p,e);
  return modular::set_mod(pre_mod),a;
}

multiple_testcases
void solve(){
  LL(a,k);
  ll p=1000000007;
  pp(kth_root_mod_prime(a,k,p));
}}