kevinzhou93-优快云博客

原创 [LeetCode]Maximum Depth of Binary Tree

Given a binary tree, find its maximum depth.The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node.首先，根据深度优先搜索的思路，用递归来做java code如下public int m

2015-05-10 20:59:11 336

原创 [LeetCode]Valid Sudoku

Determine if a Sudoku is valid, according to: Sudoku Puzzles - The Rules.The Sudoku board could be partially filled, where empty cells are filled with the character ‘.’. A partially filled sudoku whic

2015-05-09 15:01:38 723

原创 [LeetCode] Valid parentheses

Given a string containing just the characters ‘(‘, ‘)’, ‘{‘, ‘}’, ‘[’ and ‘]’, determine if the input string is valid.The brackets must close in the correct order, “()” and “()[]{}” are all valid but “

2015-05-04 22:15:54 328

原创 [LeetCode] Remove Linked List Elements

Remove all elements from a linked list of integers that have value val.Example Given: 1 –> 2 –> 6 –> 3 –> 4 –> 5 –> 6, val = 6 Return: 1 –> 2 –> 3 –> 4 –> 5java code/** * Definition for singly-linke

2015-05-03 22:58:06 484

原创 [LeetCode]Roman to Integer

guarantee了输入，简单好多 = = ruby code实现如下# @param {String} s# @return {Integer}def roman_to_int(s) symbols = {"I" => 1, "V" => 5, "X" => 10, "L" => 50, "C" => 100, "D" => 500, "M" => 1000} result =

2015-04-26 21:46:02 428

原创 LeetCode - StringToInteger - java

基本在submit，修改，submit，修改……public int myAtoi(String str) { str = str.trim(); int n = str.length(); if (n == 0) return 0; char firstChar = str.charAt(0); if(firstCh

2015-04-22 15:36:35 404

原创记录下自己拙计的算法之旅 LeetCode Rotate Array

记录下自己拙计的算法之旅LeetCode Rotate Arraydef rotate(nums, k) num_cp = nums.clone pos = k % nums.length start_pos = 0 nums.length.times do nums[pos] = num_cp[start_pos] start_pos += 1

2015-04-12 20:56:56 392

密码学SPN分组加解密

1. 实现课本简单的SPN-分组加密和解密算法； 2. 实现对任意文件的加密和解密； 3. 测试加密函数的运行速度； 4. 对加密函数进行先行密码分析。

2014-04-13

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