problem744

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744. Find Smallest Letter Greater Than Target (Easy)

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"

Example 4:

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

Example 5:

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

 

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.

Related Topics

[Array] [Binary Search]

Hints

Hint 1

Try to find whether each of 26 next letters are in the given string array.