Envío 3945

Código

#include <bits/stdc++.h>

using namespace std;

int main()
{
  string str;
  int maxDif, subStrLen, maxLen = 0, i = 0, subStrIndex;
  map<char, int> tabla;

  cin >> str;
  cin >> maxDif;

  while (i < str.length())
  {
    subStrLen = 0;
    subStrIndex = i;

    while (subStrIndex < str.length())
    {
      tabla[str[subStrIndex]];

      if (tabla.size() > maxDif)
      {
        break;
      }

      subStrLen++;
      subStrIndex++;
    }

    if (subStrLen > maxLen)
    {
      maxLen = subStrLen;
    }

    tabla.clear();
    i++;
  }

  cout << maxLen << endl;

  return 0;
}