Design Authentication Manager

// Accepted solution for LeetCode #1797: Design Authentication Manager
class AuthenticationManager {
    private int t;
    private Map<String, Integer> d = new HashMap<>();

    public AuthenticationManager(int timeToLive) {
        t = timeToLive;
    }

    public void generate(String tokenId, int currentTime) {
        d.put(tokenId, currentTime + t);
    }

    public void renew(String tokenId, int currentTime) {
        if (d.getOrDefault(tokenId, 0) <= currentTime) {
            return;
        }
        generate(tokenId, currentTime);
    }

    public int countUnexpiredTokens(int currentTime) {
        int ans = 0;
        for (int exp : d.values()) {
            if (exp > currentTime) {
                ++ans;
            }
        }
        return ans;
    }
}

/**
 * Your AuthenticationManager object will be instantiated and called as such:
 * AuthenticationManager obj = new AuthenticationManager(timeToLive);
 * obj.generate(tokenId,currentTime);
 * obj.renew(tokenId,currentTime);
 * int param_3 = obj.countUnexpiredTokens(currentTime);
 */

// Accepted solution for LeetCode #1797: Design Authentication Manager
type AuthenticationManager struct {
	t int
	d map[string]int
}

func Constructor(timeToLive int) AuthenticationManager {
	return AuthenticationManager{timeToLive, map[string]int{}}
}

func (this *AuthenticationManager) Generate(tokenId string, currentTime int) {
	this.d[tokenId] = currentTime + this.t
}

func (this *AuthenticationManager) Renew(tokenId string, currentTime int) {
	if v, ok := this.d[tokenId]; !ok || v <= currentTime {
		return
	}
	this.Generate(tokenId, currentTime)
}

func (this *AuthenticationManager) CountUnexpiredTokens(currentTime int) int {
	ans := 0
	for _, exp := range this.d {
		if exp > currentTime {
			ans++
		}
	}
	return ans
}

/**
 * Your AuthenticationManager object will be instantiated and called as such:
 * obj := Constructor(timeToLive);
 * obj.Generate(tokenId,currentTime);
 * obj.Renew(tokenId,currentTime);
 * param_3 := obj.CountUnexpiredTokens(currentTime);
 */

# Accepted solution for LeetCode #1797: Design Authentication Manager
class AuthenticationManager:
    def __init__(self, timeToLive: int):
        self.t = timeToLive
        self.d = defaultdict(int)

    def generate(self, tokenId: str, currentTime: int) -> None:
        self.d[tokenId] = currentTime + self.t

    def renew(self, tokenId: str, currentTime: int) -> None:
        if self.d[tokenId] <= currentTime:
            return
        self.d[tokenId] = currentTime + self.t

    def countUnexpiredTokens(self, currentTime: int) -> int:
        return sum(exp > currentTime for exp in self.d.values())


# Your AuthenticationManager object will be instantiated and called as such:
# obj = AuthenticationManager(timeToLive)
# obj.generate(tokenId,currentTime)
# obj.renew(tokenId,currentTime)
# param_3 = obj.countUnexpiredTokens(currentTime)

// Accepted solution for LeetCode #1797: Design Authentication Manager
use std::collections::HashMap;
struct AuthenticationManager {
    time_to_live: i32,
    map: HashMap<String, i32>,
}

/**
 * `&self` means the method takes an immutable reference.
 * If you need a mutable reference, change it to `&mut self` instead.
 */
impl AuthenticationManager {
    fn new(timeToLive: i32) -> Self {
        Self {
            time_to_live: timeToLive,
            map: HashMap::new(),
        }
    }

    fn generate(&mut self, token_id: String, current_time: i32) {
        self.map.insert(token_id, current_time + self.time_to_live);
    }

    fn renew(&mut self, token_id: String, current_time: i32) {
        if self.map.get(&token_id).unwrap_or(&0) <= &current_time {
            return;
        }
        self.map.insert(token_id, current_time + self.time_to_live);
    }

    fn count_unexpired_tokens(&self, current_time: i32) -> i32 {
        self.map
            .values()
            .filter(|&time| *time > current_time)
            .count() as i32
    }
}

// Accepted solution for LeetCode #1797: Design Authentication Manager
class AuthenticationManager {
    private timeToLive: number;
    private map: Map<string, number>;

    constructor(timeToLive: number) {
        this.timeToLive = timeToLive;
        this.map = new Map<string, number>();
    }

    generate(tokenId: string, currentTime: number): void {
        this.map.set(tokenId, currentTime + this.timeToLive);
    }

    renew(tokenId: string, currentTime: number): void {
        if ((this.map.get(tokenId) ?? 0) <= currentTime) {
            return;
        }
        this.map.set(tokenId, currentTime + this.timeToLive);
    }

    countUnexpiredTokens(currentTime: number): number {
        let res = 0;
        for (const time of this.map.values()) {
            if (time > currentTime) {
                res++;
            }
        }
        return res;
    }
}

/**
 * Your AuthenticationManager object will be instantiated and called as such:
 * var obj = new AuthenticationManager(timeToLive)
 * obj.generate(tokenId,currentTime)
 * obj.renew(tokenId,currentTime)
 * var param_3 = obj.countUnexpiredTokens(currentTime)
 */