Submission #710869

#	Time	Username	Problem	Language	Result	Execution time	Memory
710869		awu	Lightning Rod (NOI18_lightningrod)	C++14	100 / 100	1732 ms	209964 KiB

Main

#include <bits/extc++.h>
using namespace std;
#define f first
#define s second
#define all(x) x.begin(), x.end()
using pii = pair<int, int>;
signed main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  int n; cin >> n;
  vector<pii> pts(n);
  for(int i = 0; i < n; i++) {
    int x, y; cin >> x >> y;
    pts[i] = {x, y};
  }
  vector<pii> stac;
  for(auto p : pts) {
#define sb stac.back()
    while(stac.size() && p.s - p.f >= sb.s - sb.f) {
      stac.pop_back();
    }
    if(!stac.size() || p.f + p.s > sb.f + sb.s) {
      stac.push_back(p);
    }
  }
  cout << stac.size() << endl;
}

• Subtask 1: 4 / 4
• Subtask 2: 7 / 7
• Subtask 3: 12 / 12
• Subtask 4: 21 / 21
• Subtask 5: 26 / 26
• Subtask 6: 10 / 10
• Subtask 7: 20 / 20