Submission #746324

#	Time	Username	Problem	Language	Result	Execution time	Memory
746324		Trunkty	Magneti (COCI21_magneti)	C++14	0 / 110	8 ms	4172 KiB

Main

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define int ll

int n,l,ans,mod=1e9+7;
int arr[55];
int dp[55][10005];

signed main(){
    ios::sync_with_stdio(false);
    cin.tie(NULL);
    cin >> n >> l;
    for(int i=1;i<=n;i++){
        cin >> arr[i];
    }
    sort(arr+1,arr+n+1);
    dp[1][1] = 1;
    for(int i=2;i<=n;i++){
        for(int j=0;j<=l;j++){
            if(j>=arr[i]){
                dp[i][j] += dp[i-1][j-arr[i]]*2LL;
                dp[i][j] %= mod;
            }
            if(j>=arr[i]*2LL-1LL){
                dp[i][j] += dp[i-1][j-arr[i]*2LL+1LL]*(i-2LL);
                dp[i][j] %= mod;
            }
        }
    }
    for(int j=0;j<=l;j++){
        ans += dp[n][j]*(l-j+1LL);
        ans %= mod;
    }
    cout << ans << "\n";
    return 0;
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 20
• Subtask 3: 0 / 30
• Subtask 4: 0 / 50