Submission #992035

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Source Code Expand

#include <cstdio>

int N,M;
int exist[100008];
int uf[100008];
int getpa(int x) {
	if(uf[x]==x) return x;
	uf[x]=getpa(uf[x]);
	return uf[x];
}
int main() {
	scanf("%d%d",&N,&M);
	int Lmin=M+1;
	for(int i=0;i<N;i++) {
		int K,Lf,L;
		scanf("%d",&K);
		for(int j=0;j<K;j++) {
			scanf("%d",&L);
			if(Lmin>L) Lmin=L;
			if(j) {
				if(exist[L]==0) {
					exist[L]=1;
					uf[L]=L;
				}
				uf[getpa(L)]=getpa(Lf);
			} else {
				if(exist[L]==0) {
					exist[L]=1;
					uf[L]=L;
				}
				Lf=L;
			}
		}
	}
	for(int i=1;i<=M;i++) {
		if(exist[i]) if(getpa(i)!=getpa(Lmin)) {
			printf("NO\n");
			return 0;
		}
	}
	printf("YES\n");
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:12:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&N,&M);
                     ^
./Main.cpp:16:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&K);
                 ^
./Main.cpp:18:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d",&L);
                  ^

Judge Result