Given an array with n objects colored red, white or blue, sort them so that objects of the same color are adjacent, with the colors in the order red, white and...
Description: Count the number of prime numbers less than a non-negative number, n. 统计小于n的素数有多少个。 用筛法进行素数打表，边打表边记录个数。class Solution {public: int countP......
Given a range [m, n] where 0 <= m <= n <= 2147483647, return the bitwise AND of all numbers in this range, inclusive. For example, given the range [5, 7], you...
