func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, m, a, b[101];   void read() {     int c, d, k = 0;     cin >> n >> m;     for (int i = 1; i <= n; i++) cin >> a, b[i] = a + b[i - 1];     for (int i = 0; i < m; i++) {       cin >> c >> d;       k += (b[d] - b[c - 1] > 0 ? b[d] - b[c - 1] : 0);     }     cout << k;   }   int main() { read(); }   