Submission #1359798

#	Time	Username	Problem	Language	Result	Execution time	Memory
1359798		chiiu	Lightning Rod (NOI18_lightningrod)	C++20	80 / 100	1098 ms	152280 KiB

Main

#include <bits/stdc++.h>

using namespace std;


int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int n;  cin >> n;

    vector<pair<int, int>> st, v;
    st.reserve(n);

    for (int i = 0; i < n; ++i) {
        int x, y;   cin >> x >> y;
        v.push_back({x, y});
    }
    sort(v.begin(), v.end());
    for(int i = 0; i < n; ++i){
        int x = v[i].first;
        int y = v[i].second;
        int l = x - y;
        int r = x + y;

        while (!st.empty() && l <= st.back().first) {
            st.pop_back();
        }

        if (!st.empty() && r <= st.back().second) {
            continue;
        }

        st.push_back({l, r});
    }

    cout << st.size() << "\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: 0 / 20