func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int k;     cin >> k;     int a[k + 1];     for (int i = 0; i < k; i++) cin >> a[i];     long long int comb[1005][1005];     comb[0][0] = 1;     for (int i = 1; i < 1005; i++) {       comb[i][0] = 1;       for (int j = 1; j <= i; j++) {         comb[i][j] = (comb[i - 1][j] + comb[i - 1][j - 1]) % 1000000007;       }     }     long long sum = 0, ans = 1;     for (int i = 0; i < k; i++) {       ans = (ans * comb[sum + a[i] - 1][a[i] - 1]) % 1000000007;       sum += a[i];     }     cout << ans << endl;     return 0;   }   