Submission #992577


Source Code Expand

#include <bits/stdc++.h>
using namespace std;

struct UnionFind {
  vector<int> data;
  UnionFind(int size) : data(size, -1) { }
  bool unionSet(int x, int y) {
    x = root(x); y = root(y);
    if (x != y) {
      if (data[y] < data[x]) swap(x, y);
      data[x] += data[y]; data[y] = x;
    }
    return x != y;
  }
  bool findSet(int x, int y) {
    return root(x) == root(y);
  }
  int root(int x) {
    return data[x] < 0 ? x : data[x] = root(data[x]);
  }
  int size(int x) {
    return -data[root(x)];
  }
};

#define int long long
#define range(i,x,y) i=(x);i<(y);i++
#define rep(i,n) for(int i=0,i##_len=n;i<i##_len;i++)
#define all(x) begin(x),end(x)
#define lim(x,r,l) (r<=x&&x<l)
typedef long long ll;
typedef long double ld;

signed main(){
  int n, m; cin >> n >> m;
  UnionFind uf(n);
  vector<vector<int>> merged(m, vector<int>());

  rep(i,n){
    int k; cin >> k;
    rep(j, k){
      int l; cin >> l;
      merged[l-1].push_back(i);
    }
  }

  rep(l, m){
    for(int i = 0; i < (signed) merged[l].size() - 1ll; i++){
      uf.unionSet(merged[l][i], merged[l][i+1]);
    }
  }

  if(uf.size(0) == n){
    cout << "YES" << endl;
  }else{
    cout << "NO" << endl;
  }
}

Submission Info

Submission Time
Task C - Interpretation
User wass80
Language C++14 (Clang 3.8.0)
Score 0
Code Size 1247 Byte
Status CE

Compile Error

./Main.cpp:1:10: fatal error: 'bits/stdc++.h' file not found
#include <bits/stdc++.h>
         ^
1 error generated.