이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pb push_back
#define N 100010
#define ii pair<int,int>
#define fs first
#define sc second
#define ld double
#define int ll
int dp[210][210][210],n,k,sum[N];
void selfmax(int&u,int v)
{
u=max(u,v);
}
int32_t main()
{
#ifdef SKY
freopen("A.inp","r",stdin);
freopen("A.out","w",stdout);
#endif // SKY
ios::sync_with_stdio(0);
cin.tie(NULL);
cout.tie(NULL);
cin>>n>>k;
for(int i=1;i<=n;i++)
cin>>sum[i],sum[i]+=sum[i-1];
memset(dp,-0x3f3f,sizeof(dp));
for(int i=1;i<=n;i++)
for(int j=i;j<=n;j++)
dp[i][j][0]=0;
for(int t=1;t<=k;t++)
for(int l=1;l<=n;l++)
for(int r=l;r<=n;r++)
for(int i=l;i<=r;i++)
for(int c=0;c<t;c++)
{
selfmax(dp[l][r][t],dp[l][i][c]+dp[i+1][r][t-c-1]+(sum[r]-sum[i])*(sum[i]-sum[l-1]));
// if(l==4&&r==7&&t==1&&i==5)cout<<(sum[r]-sum[i])*(sum[i]-sum[l-1])<<endl;
}
// cout<<dp[4][7][1]<<endl;
cout<<dp[1][n][k];
}
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