LeetCode 394. 字符串解码

题目描述

🔥 394. 字符串解码

image-20230305172244576

思路分析

栈

参考代码

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func decodeString(s string) string {
	numStack := make([]int, 0)
	strStack := make([]string, 0)
	curStr, num := "", 0
	for i := 0; i < len(s); i++ {
		c := s[i]
		if c >= '0' && c <= '9' {
			num = num*10 + int(c-'0')
		} else if c == '[' {
			numStack = append(numStack, num)
			strStack = append(strStack, curStr)
			curStr, num = "", 0
		} else if c == ']' {
			count := numStack[len(numStack)-1]
			numStack = numStack[:len(numStack)-1]

			preStr := strStack[len(strStack)-1]
			strStack = strStack[:len(strStack)-1]

			curStr = preStr + strings.Repeat(curStr, count)
		} else {
			curStr += string(c)
		}
	}
	return curStr
}

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