SMMR-106: Boost Up

#include <bits/stdc++.h>

using namespace std;

int num[1005],dp[1005][1005];
int n,sum;

int main(){
    scanf("%d%d",&n,&sum);
    for(int i=1;i<=n;i++){
        scanf("%d",&num[i]);
    }
    for(int i=0;i<=n;i++){
        dp[i][0] = 1;
    }
    for(int i=1;i<=sum;i++){
        dp[0][i] = 0;
    }
    for(int i=1;i<=n;i++){
        for(int j=1;j<=sum;j++){
            if(j>=num[i]){
                dp[i][j] += dp[i][j-num[i]];
            }
            dp[i][j] += dp[i-1][j];
            dp[i][j] %= 1000000007;
        }
    }
    printf("%d",dp[n][sum]);
}