Submission #993235

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Source Code Expand

#include<stdio.h>
#include<vector>
#include<algorithm>
using namespace std;
int UF[110000];
int FIND(int a){
	if(UF[a]<0)return a;
	return UF[a]=FIND(UF[a]);
}
void UNION(int a,int b){
	a=FIND(a);b=FIND(b);if(a==b)return;
	UF[a]+=UF[b];UF[b]=a;
}
vector<int>g[110000];
int main(){
	int a,b;scanf("%d%d",&a,&b);
	for(int i=0;i<a;i++){
		int c;scanf("%d",&c);
		for(int j=0;j<c;j++){
			int d;scanf("%d",&d);d--;
			g[d].push_back(i);
		}
	}
	for(int i=0;i<a;i++)UF[i]=-1;
	for(int i=0;i<b;i++){
		for(int j=0;j+1<g[i].size();j++){
			UNION(g[i][j],g[i][j+1]);
		}
	}
	if(-UF[FIND(0)]==a)printf("YES\n");
	else printf("NO\n");
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:16:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  int a,b;scanf("%d%d",&a,&b);
                             ^
./Main.cpp:18:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   int c;scanf("%d",&c);
                       ^
./Main.cpp:20:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
    int d;scanf("%d",&d);d--;
                        ^

Judge Result