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  1. #include <stdio.h>
  2. #include <vector>
  3. #include <algorithm>
  4.  
  5. int main() {
  6.     int n;
  7.     scanf("%d", &n);
  8.  
  9.     std::vector<int> a(n), b(n);
  10.     for (int i = 0; i < n; ++i) {
  11.         scanf("%d %d", &a[i], &b[i]);
  12.     }
  13.  
  14.     std::vector<int> queue1(n), queue2(n);
  15.  
  16.     for (int i = 0; i < n; ++i) {
  17.         queue1[i] = i;
  18.         queue2[i] = i;
  19.     }
  20.  
  21.     std::sort(queue1.begin(), queue1.end(), [&](const int i, const int j) {
  22.         return a[i] > a[j] || (a[i] == a[j] && b[i] > b[j]);
  23.     });
  24.  
  25.     std::sort(queue2.begin(), queue2.end(), [&](const int i, const int j) {
  26.         return b[i] > b[j] || (b[i] == b[j] && a[i] > a[j]);
  27.     });
  28.  
  29.     std::vector<bool> actual(n, true);
  30.  
  31.     int sum1 = 0, sum2 = 0, pos1 = 0, pos2 = 0;
  32.     while (true) {
  33.         while (pos1 < n && actual[pos1] == false) ++pos1;
  34.         if (pos1 == n) break;
  35.         sum1 += a[pos1];
  36.         actual[pos1] = false;
  37.         while (pos2 < n && actual[pos2] == false) ++pos2;
  38.         if (pos2 == n) break;
  39.         sum2 += b[pos2];
  40.         actual[pos2] = false;
  41.     }
  42.     printf("%d", sum1-sum2);
  43.     return 0;
  44. }
Success #stdin #stdout 0s 4364KB
comments (?)
stdin 
3
1 2
3 4
5 6
stdout 
2
https://ideone.com/tdXCJy
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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