func_code_string: #include <bits/stdc++.h>   using namespace std;   const int INF = 1e9 + 10;   const long long int LINF = 1LL * INF * INF;   const int MAXN = 2e5 + 10;   const int MAXM = 5e3 + 10;   priority_queue<int> pq;   vector<vector<int> > graph;   queue<int> que;   pair<int, int> A[20];   long long int dp[20][(1 << 20)];   long long int sum[(1 << 20)];   long long int solve(int here, int cur, int n) {     if (dp[here][cur] != -1) return dp[here][cur];     long long int res = 0;     for (int i = 0; i < n; i++) {       if (i == here) continue;       if ((1 << i) & cur) {         if (A[i].second == A[here].second) continue;         res += solve(i, cur ^ (1 << here), n);         res %= 1000000007;       }     }     return dp[here][cur] = res;   }   int main() {     int n, m, k, a, b, x, y;     int cnt = 0;     int mx = 0;     int mn = INF;     int cur = 0, idx = -1;     int T;     cin >> n >> T;     for (int i = 0; i < n; i++) cin >> A[i].first >> A[i].second;     for (int i = 0; i < n; i++)       for (int j = 0; j < (1 << n); j++) dp[i][j] = -1;     for (int i = 0; i < n; i++) dp[i][(1 << i)] = 1;     for (int i = 0; i < n; i++)       for (int j = 0; j < (1 << n); j++) solve(i, j, n);     for (int i = 0; i < (1 << n); i++)       for (int j = 0; j < n; j++)         if ((1 << j) & i) sum[i] += (long long int)A[j].first;     long long int res = 0;     for (int i = 0; i < (1 << n); i++) {       if (sum[i] != T) continue;       for (int j = 0; j < n; j++)         if ((1 << j) & i) {           res += (long long int)dp[j][i];           res %= 1000000007;         }     }     cout << res;     return 0;   }   