标签：initial imu long tor color phone directory sig i++
379. Design Phone Directory
Design a Phone Directory which supports the following operations:
get: Provide a number which is not assigned to anyone.check: Check if a number is available or not.release: Recycle or release a number.
Example:
// Init a phone directory containing a total of 3 numbers: 0, 1, and 2. PhoneDirectory directory = new PhoneDirectory(3); // It can return any available phone number. Here we assume it returns 0. directory.get(); // Assume it returns 1. directory.get(); // The number 2 is available, so return true. directory.check(2); // It returns 2, the only number that is left. directory.get(); // The number 2 is no longer available, so return false. directory.check(2); // Release number 2 back to the pool. directory.release(2); // Number 2 is available again, return true. directory.check(2);
class PhoneDirectory { public: vector<int> nums; vector<bool> flag; int pos; /** Initialize your data structure here @param maxNumbers - The maximum numbers that can be stored in the phone directory. */ PhoneDirectory(int maxNumbers) { pos = maxNumbers; nums.resize(maxNumbers); flag.resize(maxNumbers); for (int i = 0; i < maxNumbers; i++) { nums[i] = i; flag[i] = true; } } /** Provide a number which is not assigned to anyone. @return - Return an available number. Return -1 if none is available. */ int get() { if (pos > 0) { int cur = nums[--pos]; flag[cur] = false; return cur; } return -1; } /** Check if a number is available or not. */ bool check(int number) { return flag[number]; } /** Recycle or release a number. */ void release(int number) { if (!flag[number]) { flag[number] = true; nums[pos++] = number; } } }; /** * Your PhoneDirectory object will be instantiated and called as such: * PhoneDirectory obj = new PhoneDirectory(maxNumbers); * int param_1 = obj.get(); * bool param_2 = obj.check(number); * obj.release(number); */
标签：initial imu long tor color phone directory sig i++
原文地址：http://www.cnblogs.com/fripside/p/6081817.html
