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Jul 16th, 2019
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  1. int longestSubstring(string s, int k) {
  2. for (int i = 0; i < s.length(); i++) {
  3. if (count(s.begin(), s.end(), s[i]) < k) {
  4. string left = s.substr(0,i);
  5. string right = s.substr(i+1,s.size()-1);
  6. return max(longestSubstring(left,k),longestSubstring(right,k));
  7. }
  8. }
  9. return s.length();
  10. }
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