chenyu

Calculate the sum of two integers a and b, but you are not allowed to use the operator + and -.Example: Given a = 1 and b = 2, return 3.Cred...

Given a word, you need to judge whether the usage of capitals in it is right or not.All letters in this word are capitals, like "USA".All le...

Given a positive integer, output its complement number. The complement strategy is to flip the bits of its binary representation.The given i...

Given a column title as appear in an Excel sheet, return its corresponding column number....Credits: Special thanks to @ts for adding this p...

Given an array nums, write a function to move all 0's to the end of it while maintaining the relative order of the non-zero elements.For exa...

Given two arrays, write a function to compute their intersection.Example: Given nums1 = [1, 2, 2, 1], nums2 = [2, 2], return [2].Each elemen...

Given a non-negative integer num, repeatedly add all its digits until the result has only one digit.Given num = 38, the process is like: 3 +...

Given an arbitrary ransom note string and another string containing letters from all the magazines, write a function that will return true i...

一共五种运算：与，或，异或，左移，右移。（1）n & （n-1）能够消灭n中最右侧的一个1。（2） 右移：除以2， 左移：乘以2。（3）异或性质：a1^a2^a3  =  a2^a3^a1 交换律，0^a=a,  a^a=0。