제출 #1319883

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1319883		trainingdnns	Lasers (NOI19_lasers)	C++20	0 / 100	34 ms	4516 KiB

lasers

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

int main() {
    
    ll l,r;
    cin>>l>>r;
    vector<vector<ll>> rows(r);
    for(ll i=0; i<r; i++) {
        ll x;
        cin>>x;
        for(ll j=0; j<x;j++) {
            ll xi;cin>>xi;
            rows[i].push_back(xi);
        }
    }
    ll ans=0;
    if(l%2==0) ans=rows[0][0]-floor(l/2)*2;
    else ans=rows[0][0]>floor(l/2) ? ((rows[0][0]-floor(l/2)-1)*2 + 1) : 0;
    cout<<ans;
}

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