Submission #1311171

#	Time	Username	Problem	Language	Result	Execution time	Memory
1311171		aryan	Lightning Rod (NOI18_lightningrod)	C++20	19 / 100	61 ms	117396 KiB

Main

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

using i64 = long long;


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

    int n;
    cin >> n;
    vector<pair<int,int>> a(n);
    vector<int> mas(n);
    assert(n <= 20);
    for(int i = 0;i < n;i++){
        int x,y;
        cin >> x >> y;
        a[i].first = x;
        a[i].second = y;
    }

    for(int i = 0;i < n;i++){
        for(int j = 0;j < n;j++){
            if(a[i].second - a[j].second >= abs(a[i].first - a[j].first)){
                mas[i] |= (1 << j);
            }
        }
    }
    int ans = n;
    for(int mask = 0;mask < (1 << n);mask++){
        int gmask = 0;
        for(int j = 0;j < n;j++){
            if((mask & (1 << j))){
                gmask |= mas[j];
            }
        }
        if(__builtin_popcount(gmask) == n){
            ans = min(ans,__builtin_popcount(mask));
        }
    }
    cout << ans << '\n';
    return 0;
}

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