Submission #5879757


Source Code Expand

#include <bits/stdc++.h>
#include <assert.h>
using namespace std;
using i64 = long long;

struct UnionFind
{
  vector<i64> data;
  UnionFind(i64 size)
  {
    data.resize(size, -1);
  }
  i64 unite(i64 x, i64 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 0;
  }
  bool same(i64 x, i64 y)
  {
    return root(x) == root(y);
  }
  i64 root(i64 x)
  {
    return data[x] < 0 ? x : data[x] = root(data[x]);
  }
  i64 size(i64 x)
  {
    return -data[root(x)];
  }
};

int main()
{
  i64 n, m;
  cin >> n >> m;
  UnionFind uf(n + m);
  for (i64 i = 0; i < n; i++)
  {
    i64 k;
    cin >> k;
    for (i64 j = 0; j < k; j++)
    {
      i64 l;
      cin >> l;
      uf.unite(i, n + l - 1);
    }
  }
  bool ans = true;
  for (i64 i = 1; i < n; i++)
    if (!uf.same(i, i - 1))
      ans = false;
  cout << (ans ? "YES" : "NO") << endl;
  return 0;
}

Submission Info

Submission Time
Task C - Interpretation
User ecto0310
Language C++14 (GCC 5.4.1)
Score 400
Code Size 1035 Byte
Status AC
Exec Time 45 ms
Memory 1792 KB

Judge Result

Set Name sample dataset1 dataset2
Score / Max Score 0 / 0 200 / 200 200 / 200
Status
AC × 2
AC × 12
AC × 27
Set Name Test Cases
sample sample-01.txt, sample-02.txt
dataset1 sample-01.txt, sample-02.txt, 01-01.txt, 01-02.txt, 01-03.txt, 01-04.txt, 01-05.txt, 01-06.txt, 01-07.txt, 01-08.txt, 01-09.txt, 01-10.txt
dataset2 sample-01.txt, sample-02.txt, 01-01.txt, 01-02.txt, 01-03.txt, 01-04.txt, 01-05.txt, 01-06.txt, 01-07.txt, 01-08.txt, 01-09.txt, 01-10.txt, 02-01.txt, 02-02.txt, 02-03.txt, 02-04.txt, 02-05.txt, 02-06.txt, 02-07.txt, 02-08.txt, 02-09.txt, 02-10.txt, 02-11.txt, 02-12.txt, 02-13.txt, sample-01.txt, sample-02.txt
Case Name Status Exec Time Memory
01-01.txt AC 1 ms 256 KB
01-02.txt AC 1 ms 256 KB
01-03.txt AC 2 ms 256 KB
01-04.txt AC 1 ms 256 KB
01-05.txt AC 1 ms 256 KB
01-06.txt AC 1 ms 256 KB
01-07.txt AC 1 ms 256 KB
01-08.txt AC 1 ms 256 KB
01-09.txt AC 1 ms 256 KB
01-10.txt AC 2 ms 256 KB
02-01.txt AC 31 ms 1024 KB
02-02.txt AC 38 ms 1024 KB
02-03.txt AC 31 ms 768 KB
02-04.txt AC 40 ms 1408 KB
02-05.txt AC 39 ms 896 KB
02-06.txt AC 40 ms 1408 KB
02-07.txt AC 41 ms 1024 KB
02-08.txt AC 32 ms 1024 KB
02-09.txt AC 45 ms 1792 KB
02-10.txt AC 37 ms 1024 KB
02-11.txt AC 37 ms 1024 KB
02-12.txt AC 35 ms 1024 KB
02-13.txt AC 35 ms 1024 KB
sample-01.txt AC 1 ms 256 KB
sample-02.txt AC 1 ms 256 KB