1662. Check If Two String Arrays are Equivalent

Easy

Given two string arrays word1 and word2, return true if the two arrays represent the same string, and false otherwise.

A string is represented by an array if the array elements concatenated in order forms the string.

Example 1:

Input: word1 = ["ab", "c"], word2 = ["a", "bc"]
Output:
 true
Explanation:
word1 represents string "ab" + "c" -> "abc"
word2 represents string "a" + "bc" -> "abc"
The strings are the same, so return true.

Example 2:

Input: word1 = ["a", "cb"], word2 = ["ab", "c"]
Output:
 false

Example 3:

Input: word1  = ["abc", "d", "defg"], word2 = ["abcddefg"]
Output:
 true

Constraints:

• 1 <= word1.length, word2.length <= 103

• 1 <= word1[i].length, word2[i].length <= 103

• 1 <= sum(word1[i].length), sum(word2[i].length) <= 103

• word1[i] and word2[i] consist of lowercase letters.

解題

一開始的解法

func arrayStringsAreEqual(word1 []string, word2 []string) bool {
    word_1 := ""
    word_2 := ""
    
    for _, val := range word1 {
        word_1 += val
    }
    
    for _, val := range word2 {
        word_2 += val
    }
    
    return word_1==word_2
}

如果把 word_1 和 word_2 改為 byte array 效率會更快、空間會更省。