func_code_string: #include <bits/stdc++.h>   using namespace std;   const int SIZE = 20 + 5;   const int Mod = 1e9 + 7;   int inv[SIZE], n;   long long a[SIZE], m, ans;   inline long long read() {     char ch = getchar();     long long f = 1, x = 0;     while (ch <  0  || ch >  9 ) {       if (ch ==  - ) f = -1;       ch = getchar();     }     while (ch >=  0  && ch <=  9 ) {       x = (x << 1) + (x << 3) + ch -  0 ;       ch = getchar();     }     return x * f;   }   inline int Qpow(int b, int p) {     long long ans = 1, t = b;     for (; p; p >>= 1, t = t * t % Mod)       if (p & 1) ans = ans * t % Mod;     return ans % Mod;   }   inline int C(long long y, int x) {     if (y < 0 || x < 0 || y < x) return 0;     y %= Mod;     if (y == 0 || x == 0) return 1;     int ans = 1;     for (int i = 0; i < x; i++) ans = (long long)ans * (y - i) % Mod;     for (int i = 1; i <= x; i++) ans = (long long)ans * inv[i] % Mod;     return ans;   }   int main() {     for (int i = 1; i <= 20; i++) inv[i] = Qpow(i, Mod - 2);     std::cin >> n >> m;     for (int i = 1; i <= n; i++) a[i] = read();     for (int x = 0; x < (1 << n); x++) {       if (!x)         ans = (ans + C(n + m - 1, n - 1)) % Mod;       else {         long long t = n + m;         int p = 0;         for (int i = 0; i < n; i++) {           if (x >> i & 1) {             p++;             t -= a[i + 1];           }         }         t -= p + 1;         if (p & 1)           ans = (ans - C(t, n - 1)) % Mod;         else           ans = (ans + C(t, n - 1)) % Mod;       }     }     printf( %lld , (ans + Mod) % Mod);     return 0;   }   