func_code_string: #include <bits/stdc++.h>   using namespace std;   int a[100 + 5];   int b[100 + 5];   int main() {     int m, n;     int l, r;     while (scanf( %d%d , &m, &n) != EOF) {       int sum = 0;       for (int i = 1; i <= m; i++) cin >> a[i];       for (int i = 1; i <= n; i++) {         cin >> l >> r;         int sum1 = 0;         for (int i = l; i <= r; i++) {           sum1 += a[i];         }         if (sum1 > 0) sum += sum1;       }       cout << sum << endl;     }     return 0;   }   