func_code_string: #include <bits/stdc++.h>   using namespace std;   inline void read(int &x) {     register char c = getchar();     x = 0;     for (; c <  0  || c >  9 ; c = getchar())       ;     for (; c >=  0  && c <=  9 ; c = getchar()) x = (x << 1) + (x << 3) + c -  0 ;   }   priority_queue<int> q;   int main() {     priority_queue<int> pq;     int n, a, b, c, d;     long long z = 0;     read(n);     while (n--) {       read(a);       read(b);       read(c);       read(d);       if (a + b < c + d)         z += max(0, a - d) - max(0, b - c);       else {         z += a + c;         q.push(a + b);         q.push(c + d);       }     }     while (!q.empty()) {       q.pop();       z -= q.top();       q.pop();     }     printf( %I64d , z);   }   