Submission #894633

#	Time	Username	Problem	Language	Result	Execution time	Memory
894633		IWKR	Lightning Rod (NOI18_lightningrod)	C++17	100 / 100	441 ms	192648 KiB

Main

#include <bits/stdc++.h>
using namespace std;

inline int readInt() {
	int x = 0;
	char ch = getchar_unlocked();
	bool s = 1;
	while (ch < '0' || ch > '9') {
		if (ch == '-') {
			s = 0;
			ch = getchar_unlocked();
		}
	}
	while (ch >= '0' && ch <= '9') {
		x = (x << 3) + (x << 1) + ch - '0';
		ch = getchar_unlocked();
	}
	return s ? x : -x;
}

stack<pair<int, int>> s;

int main() {
    int n = readInt();
    for (int i = 0; i < n; i++) {
        int x = readInt();
		int y = readInt();
        bool add = 1;
        while (s.size()) {
            int tx = s.top().first;
            int ty = s.top().second;
            if (x - tx <= ty - y) {
                add = 0;
                break;
            }
            if (x - tx <= y - ty) {
                s.pop();
            } else {
                break;
            }
        }
        if (add) {
            s.push({x, y});
        }
    }
    cout << s.size();
}

• 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