g1801_1900.s1880_check_if_word_equals_summation_of_two_words

Class Solution

java.lang.Object

g1801_1900.s1880_check_if_word_equals_summation_of_two_words.Solution

public class Solution
extends Object

1880 - Check if Word Equals Summation of Two Words.

Easy

The letter value of a letter is its position in the alphabet starting from 0 (i.e. 'a' -> 0, 'b' -> 1, 'c' -> 2, etc.).

The numerical value of some string of lowercase English letters s is the concatenation of the letter values of each letter in s, which is then converted into an integer.

• For example, if s = "acb", we concatenate each letter’s letter value, resulting in "021". After converting it, we get 21.

You are given three strings firstWord, secondWord, and targetWord, each consisting of lowercase English letters 'a' through 'j' inclusive.

Return true if the summation of the numerical values of firstWord and secondWord equals the numerical value of targetWord_, or_ false otherwise.

Example 1:

Input: firstWord = “acb”, secondWord = “cba”, targetWord = “cdb”

Output: true

Explanation:

The numerical value of firstWord is “acb” -> “021” -> 21.

The numerical value of secondWord is “cba” -> “210” -> 210.

The numerical value of targetWord is “cdb” -> “231” -> 231.

We return true because 21 + 210 == 231.

Example 2:

Input: firstWord = “aaa”, secondWord = “a”, targetWord = “aab”

Output: false

Explanation:

The numerical value of firstWord is “aaa” -> “000” -> 0.

The numerical value of secondWord is “a” -> “0” -> 0.

The numerical value of targetWord is “aab” -> “001” -> 1.

We return false because 0 + 0 != 1.

Example 3:

Input: firstWord = “aaa”, secondWord = “a”, targetWord = “aaaa”

Output: true

Explanation:

The numerical value of firstWord is “aaa” -> “000” -> 0.

The numerical value of secondWord is “a” -> “0” -> 0.

The numerical value of targetWord is “aaaa” -> “0000” -> 0.

We return true because 0 + 0 == 0.

Constraints:

• 1 <= firstWord.length, secondWord.length, targetWord.length <= 8
• firstWord, secondWord, and targetWord consist of lowercase English letters from 'a' to 'j' inclusive.

Constructor Summary

Constructors

Constructor and Description
Solution()

Method Summary

Modifier and Type	Method and Description
boolean	isSumEqual(String firstWord, String secondWord, String targetWord)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Solution

public Solution()

Method Detail

isSumEqual

public boolean isSumEqual(String firstWord,
                          String secondWord,
                          String targetWord)