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。