Submission #855040

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Source Code Expand

# include <bits/stdc++.h>
using namespace std;
# define fi cin
# define fo cout
# define x first
# define y second
# define ll long long
# define IOS ios_base :: sync_with_stdio(0)
# define CF
ll dp[55][2555];
int main(void)
{
    #ifdef CF
    #endif // CF
    srand(time(0));
    fo << fixed << setprecision(7);
    cerr << fixed << setprecision(7);
    dp[0][0] = 1;
    int n,A;
    fi>>n>>A;
    for (int t = 1;t <= n;++t)
    {
        int v;
        fi>>v;
        for (int k = t;k;--k)
            for (int i = n * 50;i >= v;--i)
                dp[k][i] += dp[k - 1][i - v];
    }
    ll ans = 0;
    for (int i = 1;i <= n;++i)
        ans += dp[i][i * A];
    fo << ans << '\n';
    return 0;
}

Submission Info

Judge Result