LeetCode 1768. Merge Strings Alternately

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.

Example 1:

Input: word1 = “abc”, word2 = “pqr”
Output: “apbqcr”
Explanation: The merged string will be merged as so:
word1: a b c
word2: p q r
merged: a p b q c r
Example 2:

Input: word1 = “ab”, word2 = “pqrs”
Output: “apbqrs”
Explanation: Notice that as word2 is longer, “rs” is appended to the end.
word1: a b
word2: p q r s
merged: a p b q r s
Example 3:

Input: word1 = “abcd”, word2 = “pq”
Output: “apbqcd”
Explanation: Notice that as word1 is longer, “cd” is appended to the end.
word1: a b c d
word2: p q
merged: a p b q c d

Constraints:

1 <= word1.length, word2.length <= 100 word1 and word2 consist of lowercase English letters.

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
/**
 * @param {string} word1
 * @param {string} word2
 * @return {string}
 */

var mergeAlternately = function(word1, word2) {
    let len1 = word1.length, len2 = word2.length;
    let short, long;
    if(len1<len2){
        short = word1;
        long = word2;
    }
    else{
        short = word2;
        long = word1;
    }
    let ret = `${short}${long}`.split('');
    let shortLen = short.length;
    for(let i=0;i<shortLen;++i){
        ret[i*2] = word1[i];
        ret[i*2 + 1] = word2[i];
    }
    return ret.join('');
};


Leave a Reply

Your email address will not be published. Required fields are marked *