Submission #155202

#	Time	Username	Problem	Language	Result	Execution time	Memory
155202		dolphingarlic	Lightning Rod (NOI18_lightningrod)	C++14	100 / 100	538 ms	191836 KiB

Main

#include <bits/stdc++.h>
using namespace std;
stack<pair<int, int> > s;
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;
}

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, 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(make_pair(x, y));
    }
    printf("%d", (int)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