1768. 交替合并字符串

题目

给你两个字符串 word1word2 。请你从 word1 开始,通过交替添加字母来合并字符串。如果一个字符串比另一个字符串长,就将多出来的字母追加到合并后字符串的末尾。

返回 合并后的字符串

示例1:

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输入:word1 = "abc", word2 = "pqr"
输出:"apbqcr"
解释:字符串合并情况如下所示:
word1: a b c
word2: p q r
合并后: a p b q c r

示例2:

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输入:word1 = "ab", word2 = "pqrs"
输出:"apbqrs"
解释:注意,word2 比 word1 长,"rs" 需要追加到合并后字符串的末尾。
word1: a b
word2: p q r s
合并后: a p b q r s

示例3:

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输入:word1 = "abcd", word2 = "pq"
输出:"apbqcd"
解释:注意,word1 比 word2 长,"cd" 需要追加到合并后字符串的末尾。
word1: a b c d
word2: p q
合并后: a p b q c d

提示:

  • 1 <= word1.length, word2.length <= 100
  • word1word2 由小写英文字母组成

解法

解法一:

Java

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public String mergeAlternately(String word1, String word2) {
StringBuilder result = new StringBuilder();
int length = Math.min(word1.length(), word2.length());
for (int i = 0;i < length;i++) {
result.append(word1.charAt(i));
result.append(word2.charAt(i));
}

if (word1.length() > length) {
result.append(word1.substring(length));
}

if (word2.length() > length) {
result.append(word2.substring(length));
}
return result.toString();
}
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