Package g2101_2200.s2124_check_if_all_as_appears_before_all_bs

Class Solution

  • public class Solution
extends Object
    2124 - Check if All A’s Appears Before All B’s.

    Easy

    Given a string s consisting of only the characters 'a' and 'b', return true if every 'a' appears before every 'b' in the string. Otherwise, return false.

    Example 1:

    Input: s = “aaabbb”

    Output: true

    Explanation:

    The ’a’s are at indices 0, 1, and 2, while the ’b’s are at indices 3, 4, and 5.

    Hence, every ‘a’ appears before every ‘b’ and we return true.

    Example 2:

    Input: s = “abab”

    Output: false

    Explanation:

    There is an ‘a’ at index 2 and a ‘b’ at index 1.

    Hence, not every ‘a’ appears before every ‘b’ and we return false.

    Example 3:

    Input: s = “bbb”

    Output: true

    Explanation: There are no ’a’s, hence, every ‘a’ appears before every ‘b’ and we return true.

    Constraints:

    • 1 <= s.length <= 100
    • s[i] is either 'a' or 'b'.

    • Constructor Detail

      • Solution

        public Solution()

    • Method Detail

      • checkString

        public boolean checkString​(String s)