744_Find_Smallest_Letter_Greater_Than_Target.java

class Solution {
    public char nextGreatestLetter(char[] letters, char target) {
        int start=0;
        int end=letters.length-1;
        while(start<=end){
            int mid=start+(end-start)/2;
            if(target<letters[mid]){
                end=mid-1;
            }
            else{
                start=mid+1;
            }
         
           }
        return letters[start%letters.length];
    }
}