This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <stdio.h>
#include <vector>
using namespace std;
vector<long long int> dp[2];
long long int maxv(vector<long long int> &v){
long long int M = v[0];
int n = v.size();
for(int i=1;i<n;i++)
M = (M>v[i]) ? M : v[i];
return M;
}
int main(){
int n, now, prev;
scanf("%d", &n);
vector<int> num;
num.resize(n);
for(int i=0;i<n;i++)
scanf("%d", &num[i]);
dp[0].resize(1000010);
dp[1].resize(1000010);
dp[0][0] = 0;
dp[0][1] = num[0];
for(int z=1;z<n;z++){
now = z%2;
prev = (z-1)%2;
dp[now][0] = maxv(dp[prev]);
for(int i=1;i<z+2;i++)
dp[now][i] = dp[prev][i-1] + i*num[z];
}
printf("%lld\n", maxv(dp[(n-1)%2]));
return 0;
}
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