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Dec 15th, 2019
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  1. class Solution {
  2. public int lengthOfLongestSubstring(String s) {
  3.  
  4. Map<Character, Integer> map = new HashMap<>();
  5.  
  6. int l = 0;
  7. int r = 0;
  8. int max = 0;
  9. char c ;
  10. //" "
  11. while(r < s.length()){
  12. c = s.charAt(r); //a
  13. if(map.containsKey(c) && map.get(c) >= l){
  14. max = Math.max(r-l, max); // 3
  15. l = map.get(c) + 1; // 1
  16. }
  17. map.put(c, r); //{a=t}
  18. r++;
  19. }
  20.  
  21. return Math.max(max, r-l);
  22.  
  23. }
  24. }
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