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上课时只听老师说过，Java取余的操作的符号位是和被除数一致的，但不知道为啥例如：-14%3 余数是 -214%-3 余数是 2后来才知道，对余数的定义是 (a/b)*b + a%b 恒等于 a这样的话，-14/3*3的结果是-4*3 = -12，所以余数是-2；14%3同理啦 阅读全文
posted @ 2017-10-21 10:30
link98
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编写递归时，最重要的有以下三点：递归总有一个最简单的情况——方法的第一条语句总是包含一个return的条件语句递归调用总是尝试解决一个规模更小的子问题，这样递归才能收敛到最简单的情况。递归调用的父问题和尝试解决的子问题之间不应该有交集。违背以上原则写出的代码可能是错误的或者低效的。 阅读全文
posted @ 2017-10-21 09:44
link98
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617. Merge Two Binary TreesGiven two binary trees and imagine that when you put one of them to cover the other, some nodes of the two trees are overla... 阅读全文
posted @ 2017-10-20 10:47
link98
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496. Next Greater Element IYou are given two arrays (without duplicates) nums1 and nums2 where nums1’s elements are subset of nums2. Find all the next... 阅读全文
posted @ 2017-10-19 22:35
link98
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463. Island PerimeterYou are given a map in form of a two-dimensional integer grid where 1 represents land and 0 represents water. Grid cells are conn... 阅读全文
posted @ 2017-10-19 18:24
link98
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669. Trim a Binary Search TreeGiven a binary search tree and the lowest and highest boundaries as L and R, trim the tree so that all its elements lies... 阅读全文
posted @ 2017-10-18 22:28
link98
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566. Reshape the MatrixIn MATLAB, there is a very useful function called 'reshape', which can reshape a matrix into a new one with different size but ... 阅读全文
posted @ 2017-10-17 11:06
link98
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今天写一道LeetCode的题的时候，遇到了List，在new的时候，IDEA的智能提示出现了很多覆盖的方法，我突然觉得奇怪，又想到之前看到的List list = new ArrayList()，就百度了一下。List类是一个接口类，它继承了 Collection 接口。List有两个重要的实现类... 阅读全文
posted @ 2017-10-16 19:31
link98
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412. Fizz BuzzWrite a program that outputs the string representation of numbers from 1 to n.But for multiples of three it should output “Fizz” instead... 阅读全文
posted @ 2017-10-16 19:03
link98
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575. Distribute CandiesGiven an integer array with even length, where different numbers in this array represent different kinds of candies. Each numbe... 阅读全文
posted @ 2017-10-16 16:44
link98
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