Submission #828309

#	Time	Username	Problem	Language	Result	Execution time	Memory
828309		vjudge1	Lasers (NOI19_lasers)	C++17	24 / 100	189 ms	6044 KiB

lasers

#include<bits/stdc++.h>
using namespace std;
const int nmax = 5*1e5+5;
int lenwall[nmax];
int main() {
    int L,R,X;
    int maxlen = 0;
    cin >> L >> R;
    for(int i=1; i<=R; i++) {
        cin >> X;
        for(int j=1; j<=X; j++) {
            cin >> lenwall[j];
            maxlen = max(maxlen, lenwall[j]);
        }
    }
    int open = L-maxlen;
    if(2*open>=L) {
        cout << "0" << endl;
    } else {
        cout << L-(2*open) << endl;
    }
    return 0;
}

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