Submission #5017415


Source Code Expand

#include<bits/stdc++.h>
using namespace std;
const int N=100005;
int f[N],a[N];
bool vis[N];
int sf(int x) {
    return f[x] == x? x: f[x] = sf(f[x]);
}
void merge(int u,int v) {
    u = sf(u), v = sf(v);
    if(u > v) swap(u,v);
    f[v] = u;
}
int main()
{
    int n,m,k;
    scanf("%d%d",&n,&m);
    for(int i=1;i<=m;i++)f[i]=i;
    for(int i=1;i<=n;i++){
        scanf("%d",&k);
        for(int j=0;j<k;j++){
            scanf("%d",&a[j]);
            vis[a[j]]=true;
        }
        for(int j=0;j<k-1;j++){
            merge(a[j], a[j+1]);
        }
    }
    int cnt = 0;
    for(int i=1;i<=m;i++) {
        if(!vis[i]) continue;
        if(i == sf(i)) cnt++;
        //cout << i << ' ' << sf(i) << endl;
    }
    //cout << "ck " << cnt << endl;
    puts(cnt==1?"YES":"NO");
}

Submission Info

Submission Time
Task C - Interpretation
User vjudge2
Language C++14 (GCC 5.4.1)
Score 400
Code Size 785 Byte
Status AC
Exec Time 17 ms
Memory 768 KB

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:17:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d",&n,&m);
                        ^
./Main.cpp:20:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d",&k);
                       ^
./Main.cpp:22:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d",&a[j]);
                              ^

Judge Result

Set Name sample dataset1 dataset2
Score / Max Score 0 / 0 200 / 200 200 / 200
Status
AC × 2
AC × 12
AC × 27
Set Name Test Cases
sample sample-01.txt, sample-02.txt
dataset1 sample-01.txt, sample-02.txt, 01-01.txt, 01-02.txt, 01-03.txt, 01-04.txt, 01-05.txt, 01-06.txt, 01-07.txt, 01-08.txt, 01-09.txt, 01-10.txt
dataset2 sample-01.txt, sample-02.txt, 01-01.txt, 01-02.txt, 01-03.txt, 01-04.txt, 01-05.txt, 01-06.txt, 01-07.txt, 01-08.txt, 01-09.txt, 01-10.txt, 02-01.txt, 02-02.txt, 02-03.txt, 02-04.txt, 02-05.txt, 02-06.txt, 02-07.txt, 02-08.txt, 02-09.txt, 02-10.txt, 02-11.txt, 02-12.txt, 02-13.txt, sample-01.txt, sample-02.txt
Case Name Status Exec Time Memory
01-01.txt AC 1 ms 256 KB
01-02.txt AC 1 ms 256 KB
01-03.txt AC 1 ms 256 KB
01-04.txt AC 1 ms 256 KB
01-05.txt AC 1 ms 256 KB
01-06.txt AC 1 ms 256 KB
01-07.txt AC 1 ms 256 KB
01-08.txt AC 1 ms 256 KB
01-09.txt AC 1 ms 256 KB
01-10.txt AC 1 ms 256 KB
02-01.txt AC 13 ms 768 KB
02-02.txt AC 16 ms 256 KB
02-03.txt AC 13 ms 512 KB
02-04.txt AC 16 ms 768 KB
02-05.txt AC 16 ms 256 KB
02-06.txt AC 16 ms 768 KB
02-07.txt AC 16 ms 256 KB
02-08.txt AC 15 ms 256 KB
02-09.txt AC 17 ms 640 KB
02-10.txt AC 14 ms 640 KB
02-11.txt AC 14 ms 640 KB
02-12.txt AC 14 ms 512 KB
02-13.txt AC 14 ms 512 KB
sample-01.txt AC 1 ms 256 KB
sample-02.txt AC 1 ms 256 KB