Package g2101_2200.s2109_adding_spaces_to_a_string

Class Solution

  • public class Solution
extends Object
    2109 - Adding Spaces to a String.

    Medium

    You are given a 0-indexed string s and a 0-indexed integer array spaces that describes the indices in the original string where spaces will be added. Each space should be inserted before the character at the given index.

    • For example, given s = "EnjoyYourCoffee" and spaces = [5, 9], we place spaces before 'Y' and 'C', which are at indices 5 and 9 respectively. Thus, we obtain "Enjoy **Y**our **C**offee".

    Return the modified string after the spaces have been added.

    Example 1:

    Input: s = “LeetcodeHelpsMeLearn”, spaces = [8,13,15]

    Output: “Leetcode Helps Me Learn”

    Explanation:

    The indices 8, 13, and 15 correspond to the underlined characters in “LeetcodeHelpsMeLearn”.

    We then place spaces before those characters.

    Example 2:

    Input: s = “icodeinpython”, spaces = [1,5,7,9]

    Output: “i code in py thon”

    Explanation:

    The indices 1, 5, 7, and 9 correspond to the underlined characters in “icodeinpython”.

    We then place spaces before those characters.

    Example 3:

    Input: s = “spacing”, spaces = [0,1,2,3,4,5,6]

    Output: " s p a c i n g"

    Explanation: We are also able to place spaces before the first character of the string.

    Constraints:

    • 1 <= s.length <= 3 * 105
    • s consists only of lowercase and uppercase English letters.
    • 1 <= spaces.length <= 3 * 105
    • 0 <= spaces[i] <= s.length - 1
    • All the values of spaces are strictly increasing.

    • Constructor Detail

      • Solution

        public Solution()

    • Method Detail

      • addSpaces

        public String addSpaces​(String string,
                        int[] spaces)