389. Find the Difference

https://leetcode.com/problems/find-the-difference/submissions/

Python

class Solution:
    def findTheDifference(self, s: str, t: str) -> str:
        chars_s = list(s)
        chars_t = list(t)

        chars_s.sort()
        chars_t.sort()

        for i in range(len(chars_s)):
            if chars_s[i] != chars_t[i]:
                return chars_t[i]
        return chars_t[-1]

Go

Sorting of rune reference here

type sortRunes []rune

func (s sortRunes) Less(i, j int) bool {
    return s[i] < s[j]
}

func (s sortRunes) Swap(i, j int) {
    s[i], s[j] = s[j], s[i]
}

func (s sortRunes) Len() int {
    return len(s)
}

func findTheDifference(s string, t string) byte {
    chars_s := []rune(s)
    chars_t := []rune(t)

    sort.Sort(sortRunes(chars_s))
    sort.Sort(sortRunes(chars_t))

    for i, char := range(chars_s) {
        if char != chars_t[i] {
            return byte(chars_t[i])
        }
    }
    return byte(chars_t[len(chars_t)-1])
}