結果
問題 |
No.3129 Multiple of Twin Subarray
|
ユーザー |
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提出日時 | 2025-04-25 21:45:51 |
言語 | C++23 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 72 ms / 2,000 ms |
コード長 | 6,250 bytes |
コンパイル時間 | 4,000 ms |
コンパイル使用メモリ | 293,856 KB |
実行使用メモリ | 49,852 KB |
最終ジャッジ日時 | 2025-04-25 21:46:12 |
合計ジャッジ時間 | 7,534 ms |
ジャッジサーバーID (参考情報) |
judge1 / judge3 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 46 |
ソースコード
#include <bits/stdc++.h> using namespace std; using ll=long long; using ull=unsigned long long; using P=pair<ll,ll>; template<typename T>using minque=priority_queue<T,vector<T>,greater<T>>; template<typename T>bool chmax(T &a,const T &b){return (a<b?(a=b,true):false);} template<typename T>bool chmin(T &a,const T &b){return (a>b?(a=b,true):false);} template<typename T1,typename T2>istream &operator>>(istream &is,pair<T1,T2>&p){is>>p.first>>p.second;return is;} template<typename T1,typename T2,typename T3>istream &operator>>(istream &is,tuple<T1,T2,T3>&a){is>>std::get<0>(a)>>std::get<1>(a)>>std::get<2>(a);return is;} template<typename T,size_t n>istream &operator>>(istream &is,array<T,n>&a){for(auto&i:a)is>>i;return is;} template<typename T>istream &operator>>(istream &is,vector<T> &a){for(auto &i:a)is>>i;return is;} template<typename T1,typename T2>void operator++(pair<T1,T2>&a,int n){a.first++,a.second++;} template<typename T1,typename T2>void operator--(pair<T1,T2>&a,int n){a.first--,a.second--;} template<typename T>void operator++(vector<T>&a,int n){for(auto &i:a)i++;} template<typename T>void operator--(vector<T>&a,int n){for(auto &i:a)i--;} #define overload3(_1,_2,_3,name,...) name #define rep1(i,n) for(int i=0;i<(int)(n);i++) #define rep2(i,l,r) for(int i=(int)(l);i<(int)(r);i++) #define rep(...) overload3(__VA_ARGS__,rep2,rep1)(__VA_ARGS__) #define reps(i,l,r) rep2(i,l,r) #define all(x) x.begin(),x.end() #define pcnt(x) __builtin_popcountll(x) #define fin(x) return cout<<(x)<<'\n',static_cast<void>(0) #define yn(x) cout<<((x)?"Yes\n":"No\n") #define uniq(x) sort(all(x)),x.erase(unique(all(x)),x.end()) template<typename T> inline int fkey(vector<T>&z,T key){return lower_bound(z.begin(),z.end(),key)-z.begin();} ll myceil(ll a,ll b){return (a+b-1)/b;} template<typename T,size_t n,size_t id=0> auto vec(const int (&d)[n],const T &init=T()){ if constexpr (id<n)return vector(d[id],vec<T,n,id+1>(d,init)); else return init; } #ifdef LOCAL #include<debug.h> #else #define debug(...) static_cast<void>(0) #define debugg(...) static_cast<void>(0) template<typename T1,typename T2>ostream &operator<<(ostream &os,const pair<T1,T2>&p){os<<p.first<<' '<<p.second;return os;} #endif struct Timer{ clock_t start; Timer(){ start=clock(); ios::sync_with_stdio(false); cin.tie(nullptr); cout<<fixed<<setprecision(16); } inline double now(){return (double)(clock()-start)/1000;} #ifdef LOCAL ~Timer(){ cerr<<"time:"; cerr<<now(); cerr<<"ms\n"; } #endif }timer; void SOLVE(); int main(){ int testcase=1; //cin>>testcase; for(int i=0;i<testcase;i++){ SOLVE(); } } #include<type_traits> #include<concepts> template<typename T> constexpr std::enable_if_t<std::numeric_limits<T>::digits<=32,int>msb(T n){return n==0?-1:31-__builtin_clz(n);} template<typename T> constexpr std::enable_if_t<(std::numeric_limits<T>::digits>32),int>msb(T n){return n==0?-1:63-__builtin_clzll(n);} template<typename T> constexpr std::enable_if_t<std::numeric_limits<T>::digits<=32,int>lsb(T n){return n==0?-1:__builtin_ctz(n);} template<typename T> constexpr std::enable_if_t<(std::numeric_limits<T>::digits>32),int>lsb(T n){return n==0?-1:__builtin_ctzll(n);} template<typename T> constexpr std::enable_if_t<std::is_integral_v<T>,T>floor_pow2(T n){return n==0?0:T(1)<<msb(n);} template<typename T> constexpr std::enable_if_t<std::is_integral_v<T>,T>ceil_pow2(T n){return n<=1?1:T(1)<<(msb(n-1)+1);} template<std::integral T> constexpr T safe_div(T a,T b){return a>=0?a/b:-((-a+b-1)/b);} template<typename M,int L=5> struct SparseTable{ using S=typename M::S; private: std::vector<S>dat,prefix,suffix; std::vector<std::vector<S>>sp; public: SparseTable(){} SparseTable(std::vector<S>a):dat(a){ int n=a.size(); n=(n+(1<<L)-1)&~((1<<L)-1); a.resize(n,M::e()); prefix=suffix=a; std::vector<S>d2(n>>L,M::e()); for(int i=0;i<d2.size();i++){ for(int j=0;j<(1<<L);j++)d2[i]=M::op(d2[i],a[(i<<L)+j]); } for(int i=0;i<(n>>L);i++){ for(int j=1;j<(1<<L);j++)prefix[(i<<L)+j]=M::op(prefix[(i<<L)+j-1],prefix[(i<<L)+j]); } for(int i=(n>>L)-1;i>=0;i--){ for(int j=(1<<L)-1;j>=1;j--)suffix[(i<<L)+j-1]=M::op(suffix[(i<<L)+j-1],suffix[(i<<L)+j]); } int d=(d2.size()==1?1:32-__builtin_clz(d2.size()-1)); sp.resize(d,d2); for(int i=1;i<d;i++){ int w=1<<i; for(int j=w;j<=d2.size();j+=w*2){ for(int k=j-2;k>=j-w;k--)sp[i][k]=M::op(d2[k],sp[i][k+1]); int r=std::min<int>(d2.size(),j+w); for(int k=j+1;k<r;k++)sp[i][k]=M::op(sp[i][k-1],d2[k]); } } } S prod(int l,int r)const{ if(l==r)return M::e(); r--; int lid=l>>L,rid=r>>L; if(lid==rid){ S ret=M::e(); for(int i=l;i<=r;i++)ret=M::op(ret,dat[i]); return ret; } else{ lid++; rid--; S mid=M::e(); if(lid==rid)mid=sp[0][lid]; else if(lid<rid){ int s=msb(lid^rid); mid=M::op(sp[s][lid],sp[s][rid]); } return M::op(suffix[l],M::op(mid,prefix[r])); } } }; template<typename T,bool allow_empty=true> struct MaxRangeSum{ static constexpr T minf=std::numeric_limits<T>::min()/2; struct S{ T sum,ans,left,right; S():sum(0),ans(allow_empty?0:minf),left(allow_empty?0:minf),right(allow_empty?0:minf){} S(T v_):sum(v_),ans(allow_empty?std::max<T>(v_,0):v_),left(allow_empty?std::max<T>(v_,0):v_),right(allow_empty?std::max<T>(v_,0):v_){} }; static inline S op(const S&x,const S&y){ S res; res.sum=x.sum+y.sum; res.ans=std::max(x.ans,y.ans); if(res.ans<x.right+y.left)res.ans=x.right+y.left; res.left=std::max(x.left,x.sum+y.left); res.right=std::max(x.right+y.sum,y.right); return res; } static inline S e(){return S();} static inline void revS(S&x){std::swap(x.left,x.right);} }; ll solve(vector<ll>a){ vector<MaxRangeSum<ll,false>::S>init(a.size()); rep(i,a.size())init[i]=a[i]; SparseTable<MaxRangeSum<ll,false>>sp(init); ll res=-1e18; rep(i,1,a.size())chmax(res,sp.prod(0,i).ans*sp.prod(i,a.size()).ans); return res; } void SOLVE(){ int n; cin>>n; vector<ll>a(n); cin>>a; ll ans=solve(a); rep(i,n)a[i]=-a[i]; chmax(ans,solve(a)); cout<<ans<<endl; }