Submission #991924

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Source Code Expand

#include <cstdio>
#include <vector>
#include <algorithm>
#include <functional>
using namespace std;

int main() {
  int N, M; scanf("%d%d", &N, &M);
  vector<vector<int>> graph(N + M);
  for(int i = 0; i < N; ++i) {
    int K; scanf("%d", &K);
    for(int j = 0; j < K; ++j) {
      int L; scanf("%d", &L); --L;
      graph[i].push_back(N+L);
      graph[N+L].push_back(i);
    }
  }
  vector<char> vis(N + M, false);
  function<void(int)> visit = [&](int v) {
    if(vis[v]) return;
    vis[v] = true;
    for(int w : graph[v]) {
      visit(w);
    }
  };
  visit(0);
  for(int i = 0; i < N; ++i) {
    if(!vis[i]) {
      printf("NO\n");
      return 0;
    }
  }
  printf("YES\n");
  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:8:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   int N, M; scanf("%d%d", &N, &M);
                                  ^
./Main.cpp:11:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     int K; scanf("%d", &K);
                           ^
./Main.cpp:13:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
       int L; scanf("%d", &L); --L;
                             ^

Judge Result