String - 71. Simplify Path
- Simplify Path
Given an absolute path for a file (Unix-style), simplify it. Or in other words, convert it to the canonical path.
In a UNIX-style file system, a period . refers to the current directory. Furthermore, a double period .. moves the directory up a level.
Note that the returned canonical path must always begin with a slash /, and there must be only a single slash / between two directory names. The last directory name (if it exists) must not end with a trailing /. Also, the canonical path must be the shortest string representing the absolute path.
Example 1:
Input: "/home/"
Output: "/home"
Explanation: Note that there is no trailing slash after the last directory name.Example 2:
Input: "/../"
Output: "/"
Explanation: Going one level up from the root directory is a no-op, as the root level is the highest level you can go.Example 3:
Input: "/home//foo/"
Output: "/home/foo"
Explanation: In the canonical path, multiple consecutive slashes are replaced by a single one.Example 4:
Input: "/a/./b/../../c/"
Output: "/c"思路：
题目意思简化一个unix系统下的路径。.代表当前目录， ..代表上一级目录，做法就是用栈来做，先把字符串根据 /切割成字符串数组，然后遍历数组，如果当前字符串是 .，就不管，继续下一个，如果是 ..就把栈顶元素弹出，其他情况就入栈，最后在把栈中的元素用 /拼接在一起就可以。
代码：
go：
func simplifyPath(path string) string {
if path == "" {
return path
}
var stack []string
pathArr := strings.Split(path, "/")
for _, p := range pathArr {
if p == "." || p == "" {
continue
} else if p == ".." {
if len(stack) != 0 {
stack = stack[:len(stack)-1]
}
} else {
stack = append(stack, p)
}
}
return "/" + strings.Join(stack, "/")
}本文参与 腾讯云自媒体同步曝光计划，分享自作者个人站点/博客。
原始发表：2020年05月17日，如有侵权请联系 cloudcommunity@tencent.com 删除
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