Check if Word Equals Summation of Two Words LeetCode solution in C++

1
class Solution {
2
 public:
3
  bool isSumEqual(string firstWord, string secondWord, string targetWord) {
4
    int first = 0, second = 0, target = 0;
5
    for (int i = 0; i < firstWord.size(); i++) first = first * 10 + (firstWord[i] - 'a');
6

7
    for (int i = 0; i < secondWord.size(); i++) second = second * 10 + (secondWord[i] - 'a');
8

9
    for (int i = 0; i < targetWord.size(); i++) target = target * 10 + (targetWord[i] - 'a');
10

11
    return first + second == target;
12
  }
13
};