제출 #112807

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
112807		Kamisama	수열 (APIO14_sequence)	C++14	11 / 100	55 ms	5084 KiB

sequence

#include <iostream>
#include <cstdio>
#include <iomanip>
#include <chrono>
//#define Kami
#define taskname "APIO14_sequence"
using namespace std;
const int maxn=1e4+3;
const int maxk=1e2+3;

struct TLines{
    long long a, b; int id;
    inline TLines(long long _a=0, long long _b=0, int _id=0){a=_a;b=_b;id=_id;}
    inline long long Value(const long long &x){return a*x+b;}
    friend inline bool isBad(const TLines &d1, const TLines &d2, const TLines &d3){
        return (d2.b-d1.b)*(d1.a-d3.a)>=(d3.b-d1.b)*(d1.a-d2.a);
    }
};

int n,k,a[maxn],trace[maxn][maxk];
long long s[maxn],f[maxn],g[maxn];
TLines convex[maxn];

inline void Enter(){
    cin>>n>>k;
    for(int i=1;i<=n;i++) cin>>a[i], s[i]=s[i-1]+a[i];
}

inline void Solve(){ // f[i] = max{ s[j]*s[i] + f[j] - s[j]^2 }
    for(int t=1;t<=k;t++){
        int best=1;
        int nConvex=0;
        swap(f,g);
        for(int i=1;i<=n;i++){
            long long x=s[i];
            TLines newline(s[i],g[i]-s[i]*s[i],i);
            while(nConvex>1 && isBad(convex[nConvex-1],convex[nConvex],newline)){
                best-=(best==nConvex);
                nConvex--;
            } convex[++nConvex]=newline;
            while(best<nConvex && convex[best].Value(x)<=convex[best+1].Value(x)) best++;
            f[i]=convex[best].Value(x);
            trace[i][t]=convex[best].id;
        }
    }
    cout<<f[n]<<'\n';
    int nG=0;
    for(int x=n,i=k;i>=1;i--) g[++nG]=x=trace[x][i];
    for(int i=nG;i;i--) cout<<g[i]<<' ';
}

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL); cout.tie(NULL); if(fopen(taskname".INP","r"))
    freopen(taskname".INP","r",stdin),
    freopen(taskname".OUT","w",stdout);
    #ifdef Kami
    auto start=chrono::steady_clock::now();
    #endif

    Enter();
    Solve();

    #ifdef Kami
    auto end=chrono::steady_clock::now();
    cerr<<"\nIn milliseconds : "
        <<chrono::duration_cast<chrono::milliseconds>(end-start).count();
    cerr<<'\n'<<"In seconds : "<<fixed<<setprecision(3)
        <<(double)chrono::duration_cast<chrono::milliseconds>(end-start).count()/1000<<'\n';
    #endif

    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

sequence.cpp: In function 'int main()':
sequence.cpp:55:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
     freopen(taskname".INP","r",stdin),
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~
     freopen(taskname".OUT","w",stdout);
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
sequence.cpp:55:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]

• Subtask 1: 0 / 11
• Subtask 2: 11 / 11
• Subtask 3: 0 / 11
• Subtask 4: 0 / 17
• Subtask 5: 0 / 21
• Subtask 6: 0 / 29