Submission #141290

#	Time	Username	Problem	Language	Result	Execution time	Memory
141290		meatrow	Lightning Rod (NOI18_lightningrod)	C++17	40 / 100	2053 ms	187876 KiB

Main

//#pragma GCC optimize("O3")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,tune=native")
//#pragma GCC optimize ("unroll-loops")
#include <bits/stdc++.h>

using namespace std;

using ll = long long;
using ld = long double;


int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    int n;
    cin >> n;
    vector<pair<int, int>> a(n);
    for (int i = 0; i < n; i++) {
        int x, y;
        cin >> x >> y;
        a[i] = { x + y, x - y };
    }
    sort(a.begin(), a.end());
    int ans = 0;
    int y = INT32_MAX;
    for (int i = n - 1; i >= 0; i--) {
        if (a[i].second < y) {
            ans++;
        }
        y = min(y, a[i].second);
    }
    cout << ans;
    return 0;
}

• Subtask 1: 0 / 4
• Subtask 2: 7 / 7
• Subtask 3: 12 / 12
• Subtask 4: 21 / 21
• Subtask 5: 0 / 26
• Subtask 6: 0 / 10
• Subtask 7: 0 / 20