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leetcode-394

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题目

题解

java版本：

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class Solution {
    public String decodeString(String s) {
        Pattern pattern = Pattern.compile("(\\d+)(\\[[a-zA-Z]+])");
        while (true) {
            Matcher matcher = pattern.matcher(s);
            if (!matcher.find()) {
                break;
            }
            int num = Integer.parseInt(matcher.group(1));
            String tmp = matcher.group(2);
            String ans = tmp.repeat(num);
            ans = ans.replaceAll("\\[", "");
            ans = ans.replaceAll("]", "");
            s = matcher.replaceFirst(ans);
        }
        return s;
    }
}

Kotlin版本：

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class Solution {
    fun decodeString(s: String): String {
        var str = s
        val pattern = Pattern.compile("(\\d+)(\\[[a-zA-Z]+])")
        while (true) {
            val matcher = pattern.matcher(str)
            if (!matcher.find()) {
                break
            }
            val num = matcher.group(1).toInt()
            val tmp = matcher.group(2)
            var ans = tmp.repeat(num)
            ans = ans.replace("\\[".toRegex(), "")
            ans = ans.replace("]".toRegex(), "")
            str = matcher.replaceFirst(ans)
        }
        return str
    }
}