Design In-Memory File System
Examples
Example 1:
Input: ["FileSystem","ls","mkdir","addContentToFile","ls","readContentFromFile"]
[[],["/"],["/a/b/c"],["/a/b/c/d","hello"],["/"],["/a/b/c/d"]]
Output: [null, [], null, null, ["a"], "hello"]
Explanation:
Example 2:
Input: ["FileSystem","mkdir","addContentToFile","addContentToFile","readContentFromFile","ls"]
[[],["/x/y"],["/x/y/file","abc"],["/x/y/file","def"],["/x/y/file"],["/x/y/file"]]
Output: [null, null, null, null, "abcdef", ["file"]]