func_code_string: #include <bits/stdc++.h>   using namespace std;   long long gcd(long long a, long long b) {     if (b == 0) return a;     return gcd(b, a % b);   }   bool checkprime(long long n) {     long long i = 2;     while (i * i <= n) {       if (n % i == 0) return 0;       i++;     }     return 1;   }   long long fact(long long n) {     if (n == 0) return 1;     return n * fact(n - 1);   }   bool compare(const pair<long long, long long>& i,                const pair<long long, long long>& j) {     return i.first < j.first;   }   int32_t main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     long long n, m;     cin >> n >> m;     long long ans = 0;     long long l[m + 1], r[m + 1], t[m + 1], c[m + 1];     for (long long i = 1; i <= m; i++) cin >> l[i] >> r[i] >> t[i] >> c[i];     for (long long i = 1; i <= n; i++) {       long long mxc = 0, mx = 100000, mxi = -1;       for (long long j = 1; j <= m; j++) {         if (i >= l[j] && i <= r[j] && t[j] < mx) {           mxi = j;           mx = t[j];           mxc = c[j];         }       }       ans += mxc;     }     cout << ans <<   n ;     return 0;   }   