Submission #1309506

#	Time	Username	Problem	Language	Result	Execution time	Memory
1309506		zxzuam	Lightning Rod (NOI18_lightningrod)	C++20	11 / 100	920 ms	49152 KiB

Main

#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
//#define int long long
using namespace std;
//using namespace __gnu_pbds;
constexpr int maxn = 1e7 + 9;
int a[maxn];
bool daun[maxn];
void solve(){
    int n;
    cin >> n;
    int cnt = 0;
    /*tree<
        int,
        null_type,
        less_equal<int>,
        rb_tree_tag,
        tree_order_statistics_node_update> s;*/
    int mx = INT_MIN;
    int mn = INT_MAX;
    for(int i = 1; i <= n; i++) {
        int x, y;
        cin >> x >> y;
        if(mx >= x + y) {
            daun[i] = 1;
            continue;
        }
        mx = x + y;
        a[i] = x - y;
    }
    for(int i = n; i >= 1; i--) {
        if(mn > a[i]) {
            if(daun[i] == 0){cnt++;}
            mn = a[i];
        }
    }
    cout << cnt;
}

int32_t main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    int tt = 1;
    //cin >> tt;
    while(tt--) {
        solve();
    }
}

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