Submission #742916

#	Time	Username	Problem	Language	Result	Execution time	Memory
742916		vjudge1	Lightning Rod (NOI18_lightningrod)	C++17	100 / 100	1763 ms	174996 KiB

Main

#include <bits/stdc++.h>
using namespace std;
 
int main() {
    cin.tie(nullptr)->sync_with_stdio(false);
 
    int N;
    cin >> N;
 
    stack <pair <int, int>> stk;
    for(int i = 1; i <= N; i++) {
        int x, y;
        cin >> x >> y;
 
        while(!stk.empty() and stk.top().first >= x - y) {
            stk.pop();
        }
        if(stk.empty() or stk.top().second < x + y) {
            stk.emplace(x - y, x + y);
        }
    }
    cout << stk.size();
    return 0;
}

• 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