Reverse string II

Leetcode 541 problem.

Function to, given a string s and an integer k, reverse the first k characters for every 2k characters counting from the start of the string.

Go

Time complexity: $O(n)$ - n is a length of a string
Auxiliary space: $O(n)$ - n is a length of a string

import "fmt"

func reverseStr(s string, k int) string {
    var result string
    var reducedString string

    for i, char := range s {
        // if i is 2x bigger than k, then just add reducedString
        if i / k % 2 == 0 {
            reducedString = string(char) + reducedString
        } else {
            // reverse the order
            result = result + reducedString + string(char)
            reducedString = ""
        }
    }

    result = result + reducedString

    return result
}

thoughtbook

Reverse string II

Go