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写了一个个位数的四则运算跟大家交流，如果大家对多位数的四则运算感兴趣可以交流学习 [code="java"] import java.util.LinkedList; class Stack{ private LinkedList memory = new LinkedList(); public void push(T arg){ memory.addFirst(arg); ...

给定待粉刷的n个墙砖(排成一行)，每个墙砖可以粉刷的颜色种类为:红、蓝、绿、黄，问粉刷完毕后，红色墙砖和蓝色墙砖都是偶数的粉刷方式有多少种(结果对10007取余). 题目解析： 首先题目问红色和蓝色都是偶数的粉刷方式，由此可以得出，其他的刷黄刷绿无所谓，都可以。因此可以把颜色分为红，蓝，其它。 题目只关注奇偶，不关注具体红蓝各刷了多少块，因此我们也只分奇偶即可。 很显然前面n-1块砖...

this is a question from leetcode: Given an array of size n, find the majority element. The majority element is the element that appears more than ⌊ n/2 ⌋ times. You may assume that the array is ...

this question is come from leetcode: Write an algorithm to determine if a number is "happy". A happy number is a number defined by the following process: Starting with any positive integer, repl...