Find Smallest Letter Greater Than Target LeetCode Solution

Problem – Find Smallest Letter Greater Than Target

Given a characters array letters that is sorted in non-decreasing order and a character target, return the smallest character in the array that is larger than target.

Note that the letters wrap around.

  • For example, if target == 'z' and letters == ['a', 'b'], the answer is 'a'.

Example 1:

Input: letters = ["c","f","j"], target = "a"
Output: "c"

Example 2:

Input: letters = ["c","f","j"], target = "c"
Output: "f"

Example 3:

Input: letters = ["c","f","j"], target = "d"
Output: "f"

Constraints:

  • 2 <= letters.length <= 104
  • letters[i] is a lowercase English letter.
  • letters is sorted in non-decreasing order.
  • letters contains at least two different characters.
  • target is a lowercase English letter.

Find Smallest Letter Greater Than Target LeetCode Solution in Python

class Solution(object):
    def nextGreatestLetter(self, letters, target):
        """
        :type letters: List[str]
        :type target: str
        :rtype: str
        """
        
        # if the number is out of bound
        if target >= letters[-1] or target < letters[0]:
            return letters[0]
        
        low = 0
        high = len(letters)-1
        while low <= high:
            mid = (high+low)//2
            
            if  target >= letters[mid]: # in binary search this would be only greater than
                low = mid+1
            
            if target < letters[mid]:
                high = mid-1
                
        return letters[low]

Find Smallest Letter Greater Than Target LeetCode Solution in Java

class Solution {
    public char nextGreatestLetter(char[] a, char x) {
        int n = a.length;
       
        if (x >= a[n - 1])   x = a[0];
        else    x++;
        
        int lo = 0, hi = n - 1;
        while (lo < hi) {
            int mid = lo + (hi - lo) / 2;
            if (a[mid] == x)    return a[mid];
            if (a[mid] < x)     lo = mid + 1;
            else    hi = mid;
        }
        return a[hi];
    }
}

Find Smallest Letter Greater Than Target LeetCode Solution in C++

class Solution {
public:
    char nextGreatestLetter(vector<char>& letters, char target) {
        auto it = upper_bound(letters.begin(), letters.end(), target);
        return it == letters.end() ? letters[0] : *it;
    }
};
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