CODE EXAMPLE FOR CSHARP

longest substring without repeating characters

class Solution {
    public int lengthOfLongestSubstring(String s) {int max=0;
        HashMap<Character,Integer>hm=new HashMap<>();
        for(int i=0,j=0;i<s.length();i++){
            if(hm.containsKey(s.charAt(i))){
                j=Math.max(j,hm.get(s.charAt(i))+1);
            }
            hm.put(s.charAt(i),i);
            max=Math.max(max,i-j+1);
        }
        return max;
        
    }
}