hdu 4283 区间dp

#include<bits/stdc++.h>
using namespace std;

#define ll long long
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define all(v) v.begin(),v.end()
#define mem(a) memset(a,0,sizeof(a))

const int N = 102;
const ll mod =1e9+7;
const int INF = 1e9+4;
const double eps = 1e-7;

ll a[N];
ll dp[N][N];
ll sum[N];

int main(){
    int t;
    cin>>t;
    int cnt= 0;
    while(t--){
        int n;
        cin>>n;
        for(int i=1;i<=n;++i)cin>>a[i];
        for(int i=1;i<=n;++i){
            for(int j=i+1;j<=n;++j)
                dp[i][j]=INF;
        }
        for(int i=1;i<=n;++i)
            sum[i] = sum[i-1]+a[i];

        for(int len=1;len<n;++len){
            for(int i=1;i+len<=n;++i){
                int j =i+len;
                for(int k=i;k<=j;++k){
                    dp[i][j] =min(dp[i][j],a[i]*(k-i) + (k-i+1)*(sum[j]-sum[k])+dp[i+1][k]+dp[k+1][j]);
                }
            }
        }
        printf("Case #%d: %d\n",++cnt,dp[1][n]);
    }
    return 0;
}