Problem Description
You are given two strings word1 and word2. Merge the strings by adding letters in alternating order, starting with word1. If a string is longer than the other, append the additional letters onto the end of the merged string.
Return the merged string.
Solution
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class Solution {
public String mergeAlternately(String word1, String word2) {
StringBuffer sb = new StringBuffer();
int idx = 0;
int n = word1.length();
int m = word2.length();
while(idx < n && idx < m){
sb.append(String.valueOf(word1.charAt(idx)));
sb.append(String.valueOf(word2.charAt(idx)));
idx++;
}
while(idx < n)
sb.append(String.valueOf(word1.charAt(idx++)));
while(idx < m)
sb.append(String.valueOf(word2.charAt(idx++)));
return sb.toString();
}
}