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 |
|
|
|
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 |