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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4.  
  5. const int N = 1e6 + 3;
  6.  
  7. int n;
  8. pair<int, int> p[N];
  9.  
  10. void rotate_points(){
  11.     for(int i = 0; i < n; ++i)
  12.         p[i] = {p[i].first - p[i].second, p[i].first + p[i].second};
  13. }
  14.  
  15. int main(){
  16.     ios::sync_with_stdio(false);
  17.     cin.tie(NULL);
  18.  
  19.     cin >> n;
  20.     for(int i = 0; i < n; ++i)
  21.         cin >> p[i].second >> p[i].first;
  22.  
  23.     rotate_points();
  24.     sort(p, p + n, [&](auto l, auto r){
  25.         if(l.first != r.first)
  26.             return l.first < r.first;
  27.         return l.second > r.second;
  28.     });
  29.  
  30.     multiset<int> ms;
  31.     for(int i = 0; i < n; ++i){
  32.         auto it = ms.lower_bound(p[i].second);
  33.         if(it != ms.end()) ms.erase(it);
  34.         ms.insert(p[i].second);
  35.     }
  36.     cout << ms.size() << "\n";
  37. }
  38.  
Success #stdin #stdout 0s 5240KB
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https://ideone.com/BPRfwR
language:
C++14 (gcc 8.3)
created:
16 days ago
visibility:
public

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