Submission #743213

#	Time	Username	Problem	Language	Result	Execution time	Memory
743213		vjudge1	Lasers (NOI19_lasers)	C++17	0 / 100	2 ms	1236 KiB

lasers

#include<bits/stdc++.h>

using namespace std;

using ll = long long ;
using pii = pair<ll , ll> ;
using i3 = tuple<ll , ll , ll> ;

const int N = 1e5+5 ;

int n , m , cnt , ans ;
int l , r ;
int qs[N] ;

int main(){
    ios_base::sync_with_stdio(0); cin.tie(0);

    cin >> l >> r ;

    for(int i=1;i<=r;i++){
        int x , y ; cin >> x >> y ;

        int st = l - y + 1 , ed = y ;

        if(st <= ed){
            qs[st]++ , qs[min(ed+1 , l+1)]-- ;
        }
    }
    for(int i=1;i<=l;i++){
        qs[i] += qs[i-1] ;

        if(qs[i] > 0) ans++ ;
    }

    cout << ans ;
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 14
• Subtask 3: 0 / 20
• Subtask 4: 0 / 21
• Subtask 5: 0 / 22
• Subtask 6: 0 / 13