2451-OddStringDifference.go

package main

// 2451. Odd String Difference
// You are given an array of equal-length strings words. 
// Assume that the length of each string is n.

// Each string words[i] can be converted into a difference integer array difference[i] of length n - 1 
// where difference[i][j] = words[i][j+1] - words[i][j] where 0 <= j <= n - 2. 
// Note that the difference between two letters is the difference between their positions in the alphabet i.e. 
// the position of 'a' is 0, 'b' is 1, and 'z' is 25.
//     For example, for the string "acb", the difference integer array is [2 - 0, 1 - 2] = [2, -1].

// All the strings in words have the same difference integer array, except one. 
// You should find that string.

// Return the string in words that has different difference integer array.

// Example 1:
// Input: words = ["adc","wzy","abc"]
// Output: "abc"
// Explanation: 
// - The difference integer array of "adc" is [3 - 0, 2 - 3] = [3, -1].
// - The difference integer array of "wzy" is [25 - 22, 24 - 25]= [3, -1].
// - The difference integer array of "abc" is [1 - 0, 2 - 1] = [1, 1]. 
// The odd array out is [1, 1], so we return the corresponding string, "abc".

// Example 2:
// Input: words = ["aaa","bob","ccc","ddd"]
// Output: "bob"
// Explanation: All the integer arrays are [0, 0] except for "bob", which corresponds to [13, -13].

// Constraints:
//     3 <= words.length <= 100
//     n == words[i].length
//     2 <= n <= 20
//     words[i] consists of lowercase English letters.

import "fmt"

func oddString(words []string) string {
    index := 0
    for k, word := range words {
        for c, v := range word {
            if c > 0 && (words[0][c] - words[0][c-1]) ^ (byte(v) - word[c-1]) != 0  {
                if index != 0 { return words[0] }
                index = k
                break 
            } 
        }
    }
    return words[index]
}

func main() {
    // Example 1:
    // Input: words = ["adc","wzy","abc"]
    // Output: "abc"
    // Explanation: 
    // - The difference integer array of "adc" is [3 - 0, 2 - 3] = [3, -1].
    // - The difference integer array of "wzy" is [25 - 22, 24 - 25]= [3, -1].
    // - The difference integer array of "abc" is [1 - 0, 2 - 1] = [1, 1]. 
    // The odd array out is [1, 1], so we return the corresponding string, "abc".
    fmt.Println(oddString([]string{"adc","wzy","abc"})) // "abc"
    // Example 2:
    // Input: words = ["aaa","bob","ccc","ddd"]
    // Output: "bob"
    // Explanation: All the integer arrays are [0, 0] except for "bob", which corresponds to [13, -13].
    fmt.Println(oddString([]string{"aaa","bob","ccc","ddd"})) // "bob"

    fmt.Println(oddString([]string{"bluefrog", "leetcode", "frogblue"})) // "bluefrog"
}