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solution.js
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solution.js
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/**
* Initialize your data structure here
@param maxNumbers - The maximum numbers that can be stored in the phone directory.
* @param {number} maxNumbers
*/
var PhoneDirectory = function (maxNumbers) {
const sequence = [];
for (let i = maxNumbers - 1; i > -1; i--) {
sequence.push(i);
}
this.sequence = sequence;
this.inUseSet = new Set();
};
/**
* Provide a number which is not assigned to anyone.
@return - Return an available number. Return -1 if none is available.
* @return {number}
*/
PhoneDirectory.prototype.get = function () {
if (this.sequence.length === 0) {
return -1;
}
const result = this.sequence.pop();
this.inUseSet.add(result);
return result;
};
/**
* Check if a number is available or not.
* @param {number} number
* @return {boolean}
*/
PhoneDirectory.prototype.check = function (number) {
return !this.inUseSet.has(number);
};
/**
* Recycle or release a number.
* @param {number} number
* @return {void}
*/
PhoneDirectory.prototype.release = function (number) {
if (this.inUseSet.has(number)) {
this.inUseSet.delete(number);
this.sequence.push(number);
}
};
/**
* Your PhoneDirectory object will be instantiated and called as such:
* var obj = new PhoneDirectory(maxNumbers)
* var param_1 = obj.get()
* var param_2 = obj.check(number)
* obj.release(number)
*/