- 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. 复制
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. 复制
Example 3:
Input: "/home//foo/"
Output: "/home/foo"
Explanation: In the canonical path, multiple consecutive slashes are replaced by a single one. 复制
Example 4:
Input: "/a/./b/../../c/"
Output: "/c" 复制
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, "/")
} 复制