JAVASCRIPT

longest string

function longestString() {
 var longest = ' ';
for (var i=0; i < arguments.length; i++) {
  if(arguments[i].length > longest.length) {
    longest = arguments[i];
  }
}
return longest;
 

}

console.log(longestString("asda", "asdasdasd", "12311","akjsdgkjagsdkjagkjdgkajsgdkjas"));

longest substring

Copy
class Solution:
    def lengthOfLongestSubstring(self, s: str) -> int:
        if s == '':
            return 0;
        
        l = set();
        m = 0;
        i = 0;
        j = 0;
        
        while(i<len(s)):
            if(s[i] not in l):
                l.add(s[i])
                i+=1
            else:
                m = max(m,len(l));
                l.remove(s[j])
                j+=1
                
        m = max(m,len(l));
        return m;