Submission #1319900

#	Time	Username	Problem	Language	Result	Execution time	Memory
1319900		trainingdnns	Lasers (NOI19_lasers)	C++20	24 / 100	224 ms	27456 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 ma=0;
    for(int i=0; i<r; i++) {
        ma=max(ma, rows[i][0]);
    }
    rows[0][0]=ma;
    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;
    ll zero=0;
    cout<<max(ans, zero);
}

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