CodeChef/hashCp at master · CodeFlowOrg/CodeChef · GitHub

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#include <bits/stdc++.h>

using namespace std;

bool untracable(string mag[], string note[], int m, int n)
{

  unordered_map<string, int> words;
  for(int i = 0; i < n; i++)
  {
    words[mag[i]] = words[mag[i]] + 1;
  }

  for(int i = 0; i < n; i++)
  {
    if(words[note[i]] > 0)
    {
      words[note[i]]--;
    }
    else{
      return false;
    }
  }
  return true;
}

int main()
{
  string mag[30000];
  string note[30000];

  int m, n;
  cin >> m >> n;

  for(int i = 0; i < m; i++)
  {
    cin >> mag[i];
  }
  for(int i = 0; i < n; i++)
  {
    cin >> note[i];
  }

  if(untracable(mag, note, m, n))
  {
    cout << "yes";
  }
  else{
    cout << "no";
  }
}