1768. Merge Strings Alternately

🟩 Easy

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.

Hint-1

Use two pointers, one pointer for each string. Alternately choose the character from each pointer, and move the pointer upwards.

Solution

My Solution

func mergeAlternately(word1 string, word2 string) string {
    s := strings.Builder{}

    m :=min(len(word1),len(word2))
    i:=0
    for i<m {
        s.WriteByte(word1[i])
        s.WriteByte(word2[i])
        i++
    }

    for i<len(word1) {
        s.WriteByte(word1[i])
        i++
    }

    for i<len(word2) {
        s.WriteByte(word2[i])
        i++
    }

    return s.String()
}

result

Leetcode: link