Submission #667992

#	Time	Username	Problem	Language	Result	Execution time	Memory
667992		bashkort	Lightning Rod (NOI18_lightningrod)	C++17	100 / 100	1582 ms	76200 KiB

Main

#include <bits/stdc++.h>

using namespace std;

constexpr int N = 100000000;

int stk1[N], stk2[N], top = 0;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int n;
    cin >> n;
    for (int i = 0; i < n; ++i) {
        int x, y;
        cin >> x >> y;

        while (top > 0 && stk1[top - 1] >= x - y) {
            --top;
        }

        if (top == 0 || stk2[top - 1] < x + y) {
            stk1[top] = x - y, stk2[top] = x + y;
            top += 1;
        }
    }

    cout << top << '\n';

    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