func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, a[1003];   const int mod = 1000000007;   int comb[1005][1005], i, j;   int main() {     int lim = 1002;     for (i = 1; i <= lim; i++) comb[i][i] = comb[i][0] = 1;     for (i = 2; i <= lim; i++)       for (j = 1; j < i; j++) {         long long aux = comb[i - 1][j] + comb[i - 1][j - 1];         aux %= mod;         comb[i][j] = aux;       }     cin >> n;     for (i = 1; i <= n; i++) cin >> a[i];     long long ans = 1;     long long nr = a[1];     for (i = 2; i <= n; i++) {       int en = a[i] - 1;       ans = (1LL * ans * comb[en + nr][en]) % mod;       nr += a[i];     }     cout << ans;     return 0;   }   