Submission #856786

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Source Code Expand

#include <cstdlib>
#include <cmath>
#include <climits>
#include <cfloat>
#include <map>
#include <utility>
#include <set>
#include <iostream>
#include <memory>
#include <string>
#include <vector>
#include <algorithm>
#include <functional>
#include <sstream>
#include <deque>
#include <complex>
#include <stack>
#include <queue>
#include <cstdio>
#include <cctype>
#include <cstring>
#include <ctime>
#include <iterator>
#include <tuple>
#include <bitset>
#include <numeric>
#include <list>
#include <iomanip>
#include <cassert>
#include <array>
#include <tuple>
#include <initializer_list>
#include <unordered_set>
#include <unordered_map>
#include <forward_list>
using namespace std;
using ll = long long;


ll const mod = 1e9 + 7;
int n, a;

ll dp[51][51][2570]; // iコメまでからj個選んで和をkにする

int main() {
    int x[55];
    while (cin >> n >> a) {
        int s = 0;
        for (int i = 0; i < n; i++) {
            cin >> x[i];
            s += x[i];
        }

        memset(dp, 0, sizeof dp);
        dp[0][0][0] = 1;
        for (int i = 0; i < n; i++) {
            for (int j = 0; j <= i; j++) {
                for (int k = 0; k <= s; k++) {
                    dp[i + 1][j + 1][k + x[i]] += dp[i][j][k];
                    dp[i + 1][j][k] += dp[i][j][k];
                }
            }
        }
        ll ans = 0;
        for (int i = 1; i <= n; ++i) {
            ans += dp[n][i][i*a];
        }
        cout << ans << endl;
    }
}

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