Submission #487509

#	Time	Username	Problem	Language	Result	Execution time	Memory
487509		ETK	Cigle (COI21_cigle)	C++14	0 / 100	5 ms	7760 KiB

cigle

#include <bits/stdc++.h>
#define rep(i,a,b) for(int i=(a);i<=(b);++i)
#define per(i,a,b) for(int i=(a);i>=(b);--i)
#define pii pair<int,int>
#define vi vector<int>
#define fi first
#define se second
#define pb push_back
#define ALL(x) x.begin(),x.end()
#define ll long long
using namespace std;
inline ll read(){
    ll x=0,f=1;char ch=getchar();
    while (!isdigit(ch)){if (ch=='-') f=-1;ch=getchar();}
    while (isdigit(ch)){x=x*10+ch-48;ch=getchar();}
    return x*f;
}
const int N=5e3+5;
int a[N],dp[N][N],g[N][N],pos[N][N];
void Max(int &a,const int b){if(a<b)a=b;}
int main(){
    int n=read();
    rep(i,1,n)a[i]=read();
    rep(i,1,n){
        int sum=0,pre=0,p=i-1;
        rep(j,i,n){
            dp[i][j]=dp[i-1][i-1];
            g[i][j]=g[i][j-1];
            sum+=a[j];
            while(p&&pre+a[p]<=sum)pre+=a[p--];
            if(sum==pre)g[i][j]++;
            pos[i][j]=p;
            if(pos[i][j-1])Max(dp[i][j-1],dp[pos[i][j-1]][i-1]+g[i][j-1]);
            Max(dp[i][j],dp[i][j-1]);
            Max(dp[i][j],dp[i-1][j]);
        }
    }
    printf("%d\n",dp[n][n]);
    return 0;
}

• Subtask 1: 0 / 9
• Subtask 2: 0 / 11
• Subtask 3: 0 / 13
• Subtask 4: 0 / 15
• Subtask 5: 0 / 52