Submission #992593

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Source Code Expand

#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <cmath>
#include <iostream>
#include <algorithm>
#include <string>
#include <vector>
#include <queue>
#include <map>
#define F first
#define S second
using namespace std;

int p[111111];
void init(int x){
  for(int i = 0; i <= x; i++) p[i] = i;
}
int find(int x){
  return p[x]==x?x:p[x]=find(p[x]);
}

bool same(int x,int y){
  return find(x) == find(y);
}

void merge(int x,int y){
  p[find(x)] = find(y);
}


int n,m;
int k[111111];
vector<int> l[111111];
int main(void){
  scanf("%d %d",&n,&m);


  init(m);
  for(int i = 0; i < n; i++){
    scanf("%d",k+i);
    for(int j = 0; j < k[i]; j++){
      int ll;
      scanf("%d",&ll);
      l[i].push_back(ll);
      if(j){
	merge(l[i][0],l[i][j]);
      }
    }
  }

  bool f = true;
  for(int i = 1; i < n; i++){
    if(!same(l[0][0],l[i][0])) f = false;
  }
  if(f) puts("YES");
  else puts("NO");
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:36:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d",&n,&m);
                       ^
./Main.cpp:41:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",k+i);
                    ^
./Main.cpp:44:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
       scanf("%d",&ll);
                      ^

Judge Result