1662. Check If Two String Arrays are Equivalent

package LeetCode_1662

/**
 * 1662. Check If Two String Arrays are Equivalent
 * https://leetcode.com/problems/check-if-two-string-arrays-are-equivalent/
 *
 * 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
 * */
class Solution {
    /*
    * Time:O(n), Space:O(n)
    * */
    fun arrayStringsAreEqual(word1: Array<String>, word2: Array<String>): Boolean {
        val sb1 = StringBuilder()
        val sb2 = StringBuilder()
        for (c in word1){
            sb1.append(c)
        }
        for (c in word2){
            sb2.append(c)
        }
        return sb1.toString() == sb2.toString()
    }
}