func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 1e5 + 10;   const int M = 1e4 + 10;   const int MOD = 1e9 + 7;   const int inf = 1e9;   const double pi = acos(-1.0);   const double eps = 1e-6;   int dx[] = {0, -1, 0, 1};   int dy[] = {1, 0, -1, 0};   int n, m;   int a[101];   int sum[102];   int l, r;   int res;   int main() {     cin >> n >> m;     sum[0] = 0;     for (int i = 0; i < n; i++) {       cin >> a[i];       sum[i + 1] += sum[i] + a[i];     }     for (int i = 0; i < m; i++) {       cin >> l >> r;       int v = sum[r] - sum[l - 1];       if (v > 0) res += v;     }     cout << res;     return 0;   }   