1166. Design File System

Description

You are asked to design a file system that allows you to create new paths and associate them with different values.

The format of a path is one or more concatenated strings of the form: / followed by one or more lowercase English letters. For example, "/leetcode" and "/leetcode/problems" are valid paths while an empty string "" and "/" are not.

Implement the FileSystem class:

bool createPath(string path, int value) Creates a new path and associates a value to it if possible and returns true. Returns false if the path already exists or its parent path doesn't exist.
int get(string path) Returns the value associated with path or returns -1 if the path doesn't exist.

Example 1:

Input: 
["FileSystem","createPath","get"]
[[],["/a",1],["/a"]]
Output: 
[null,true,1]
Explanation: 
FileSystem fileSystem = new FileSystem();

fileSystem.createPath("/a", 1); // return true
fileSystem.get("/a"); // return 1

Example 2:

Input: 
["FileSystem","createPath","createPath","get","createPath","get"]
[[],["/leet",1],["/leet/code",2],["/leet/code"],["/c/d",1],["/c"]]
Output: 
[null,true,true,2,false,-1]
Explanation: 
FileSystem fileSystem = new FileSystem();

fileSystem.createPath("/leet", 1); // return true
fileSystem.createPath("/leet/code", 2); // return true
fileSystem.get("/leet/code"); // return 2
fileSystem.createPath("/c/d", 1); // return false because the parent path "/c" doesn't exist.
fileSystem.get("/c"); // return -1 because this path doesn't exist.

Constraints:

2 <= path.length <= 100
1 <= value <= 10⁹
Each path is valid and consists of lowercase English letters and '/'.
At most 10⁴ calls in total will be made to createPath and get.

Solutions

Related to 588-Design-In-Memory-File-System, and this question is simplified version of 588-Design-In-Memory-File-System

Solution 1: Trie

We can use a trie to store the paths, where each node stores a value, representing the value of the path corresponding to the node.

The structure of the trie node is defined as follows:

children: Child nodes, stored in a hash table, where the key is the path of the child node, and the value is the reference to the child node.
v: The value of the path corresponding to the current node.

The methods of the trie are defined as follows:

insert(w, v): Insert the path $w$ and set its corresponding value to $v$. If the path $w$ already exists or its parent path does not exist, return false, otherwise return true. The time complexity is $O(|w|)$, where $|w|$ is the length of the path $w$.
search(w): Return the value corresponding to the path $w$. If the path $w$ does not exist, return $-1$. The time complexity is $O(|w|)$.

The total time complexity is $O(\sum_{w \in W}|w|)$, and the total space complexity is $O(\sum_{w \in W}|w|)$, where $W$ is the set of all inserted paths.

class Trie {
    Map<String, Trie> children = new HashMap<>();
    int v;

    Trie(int v) {
        this.v = v;
    }

    boolean insert(String w, int v) {
        Trie node = this;
        var ps = w.split("/");
        for (int i = 1; i < ps.length - 1; ++i) {
            var p = ps[i];
            if (!node.children.containsKey(p)) {
                return false;
            }
            node = node.children.get(p);
        }
        if (node.children.containsKey(ps[ps.length - 1])) {
            return false;
        }
        node.children.put(ps[ps.length - 1], new Trie(v));
        return true;
    }

    int search(String w) {
        Trie node = this;
        var ps = w.split("/");
        for (int i = 1; i < ps.length; ++i) {
            var p = ps[i];
            if (!node.children.containsKey(p)) {
                return -1;
            }
            node = node.children.get(p);
        }
        return node.v;
    }
}

class FileSystem {
    private Trie trie = new Trie(-1);

    public FileSystem() {
    }

    public boolean createPath(String path, int value) {
        return trie.insert(path, value);
    }

    public int get(String path) {
        return trie.search(path);
    }
}

/**
 * Your FileSystem object will be instantiated and called as such:
 * FileSystem obj = new FileSystem();
 * boolean param_1 = obj.createPath(path,value);
 * int param_2 = obj.get(path);
 */

class Trie {
public:
    unordered_map<string, Trie*> children;
    int v;

    Trie(int v) {
        this->v = v;
    }

    bool insert(string& w, int v) {
        Trie* node = this;
        auto ps = split(w, '/');
        for (int i = 1; i < ps.size() - 1; ++i) {
            auto p = ps[i];
            if (!node->children.count(p)) {
                return false;
            }
            node = node->children[p];
        }
        if (node->children.count(ps.back())) {
            return false;
        }
        node->children[ps.back()] = new Trie(v);
        return true;
    }

    int search(string& w) {
        Trie* node = this;
        auto ps = split(w, '/');
        for (int i = 1; i < ps.size(); ++i) {
            auto p = ps[i];
            if (!node->children.count(p)) {
                return -1;
            }
            node = node->children[p];
        }
        return node->v;
    }

private:
    vector<string> split(string& s, char delim) {
        stringstream ss(s);
        string item;
        vector<string> res;
        while (getline(ss, item, delim)) {
            res.emplace_back(item);
        }
        return res;
    }
};

class FileSystem {
public:
    FileSystem() {
        trie = new Trie(-1);
    }

    bool createPath(string path, int value) {
        return trie->insert(path, value);
    }

    int get(string path) {
        return trie->search(path);
    }

private:
    Trie* trie;
};

/**
 * Your FileSystem object will be instantiated and called as such:
 * FileSystem* obj = new FileSystem();
 * bool param_1 = obj->createPath(path,value);
 * int param_2 = obj->get(path);
 */

'''
>>> "/a/b/c".split('/')
['', 'a', 'b', 'c']
'''

class Trie:
    def __init__(self, v: int = -1):
        self.children = {}
        self.v = v

    def insert(self, w: str, v: int) -> bool:
        node = self
        ps = w.split("/")
        for p in ps[1:-1]:
            if p not in node.children:
                return False
            node = node.children[p]
        if ps[-1] in node.children:
            return False
        node.children[ps[-1]] = Trie(v)
        return True

    def search(self, w: str) -> int:
        node = self
        for p in w.split("/")[1:]:
            if p not in node.children:
                return -1
            node = node.children[p]
        return node.v


class FileSystem:
    def __init__(self):
        self.trie = Trie()

    def createPath(self, path: str, value: int) -> bool:
        return self.trie.insert(path, value)

    def get(self, path: str) -> int:
        return self.trie.search(path)


# Your FileSystem object will be instantiated and called as such:
# obj = FileSystem()
# param_1 = obj.createPath(path,value)
# param_2 = obj.get(path)

type trie struct {
	children map[string]*trie
	v        int
}

func newTrie(v int) *trie {
	return &trie{map[string]*trie{}, v}
}

func (t *trie) insert(w string, v int) bool {
	node := t
	ps := strings.Split(w, "/")
	for _, p := range ps[1 : len(ps)-1] {
		if _, ok := node.children[p]; !ok {
			return false
		}
		node = node.children[p]
	}
	if _, ok := node.children[ps[len(ps)-1]]; ok {
		return false
	}
	node.children[ps[len(ps)-1]] = newTrie(v)
	return true
}

func (t *trie) search(w string) int {
	node := t
	ps := strings.Split(w, "/")
	for _, p := range ps[1:] {
		if _, ok := node.children[p]; !ok {
			return -1
		}
		node = node.children[p]
	}
	return node.v
}

type FileSystem struct {
	trie *trie
}

func Constructor() FileSystem {
	return FileSystem{trie: newTrie(-1)}
}

func (this *FileSystem) CreatePath(path string, value int) bool {
	return this.trie.insert(path, value)
}

func (this *FileSystem) Get(path string) int {
	return this.trie.search(path)
}

/**
 * Your FileSystem object will be instantiated and called as such:
 * obj := Constructor();
 * param_1 := obj.CreatePath(path,value);
 * param_2 := obj.Get(path);
 */

class Trie {
    children: Map<string, Trie>;
    v: number;

    constructor(v: number) {
        this.children = new Map<string, Trie>();
        this.v = v;
    }

    insert(w: string, v: number): boolean {
        let node: Trie = this;
        const ps = w.split('/').slice(1);
        for (let i = 0; i < ps.length - 1; ++i) {
            const p = ps[i];
            if (!node.children.has(p)) {
                return false;
            }
            node = node.children.get(p)!;
        }
        if (node.children.has(ps[ps.length - 1])) {
            return false;
        }
        node.children.set(ps[ps.length - 1], new Trie(v));
        return true;
    }

    search(w: string): number {
        let node: Trie = this;
        const ps = w.split('/').slice(1);
        for (const p of ps) {
            if (!node.children.has(p)) {
                return -1;
            }
            node = node.children.get(p)!;
        }
        return node.v;
    }
}

class FileSystem {
    trie: Trie;

    constructor() {
        this.trie = new Trie(-1);
    }

    createPath(path: string, value: number): boolean {
        return this.trie.insert(path, value);
    }

    get(path: string): number {
        return this.trie.search(path);
    }
}

/**
 * Your FileSystem object will be instantiated and called as such:
 * var obj = new FileSystem()
 * var param_1 = obj.createPath(path,value)
 * var param_2 = obj.get(path)
 */

1166 - Design File System

1166. Design File System

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1166. Design File System

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