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LeetCode: Remove Duplicates from Sorted Array [025]
【题目】 Given a sorted array, remove the duplicates in place such that each element appear only once and return the new length. Do not allocate extra space for another array, you must do this in place with constant memory. For example, Given input array A ...
分类:其他好文   时间:2014-05-18 18:25:19    阅读次数:272
STL算法 — sort
能使用STL的sort系列算法的前提是容器的迭代器必须为随机迭代器。所以,vector和deque天然适用。STL的sort算法采用了一些策略,在不同情况下采用不同的排序算法,以达到各种算法优势互补的效果。基本的原则是:数据量大时采用快速排序,数据量小时采用插入排序(这是对快排常用的一种优化策略),递归层次过深改用堆排序。 首先是插入排序。它的平均和最坏时间复杂度都为O(N²),量级小于...
分类:其他好文   时间:2014-05-18 14:40:31    阅读次数:241
看看PHP迭代器的内部执行过程
下面我们来了解如何实现一个自定义的迭代器,然后再开始慢慢理解迭代器的内部工作原理。先来看一个官方的例子: <?php class myIterator implements Iterator { private $position = 0; private $array = array( "first_element", "second_element", "last_element", );...
分类:Web程序   时间:2014-05-18 13:58:23    阅读次数:404
[LeetCode]4Sum
4Sum Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target? Find all unique quadruplets in the array which gives the sum of target....
分类:其他好文   时间:2014-05-18 13:49:09    阅读次数:306
LeetCode 016 3Sum Closest
【题目】 Given an array S of n integers, find three integers in S such that the sum is closest to a given number, target. Return the sum of the three integers. You may assume that each input would have exactly one solution. For example, given array S = {...
分类:其他好文   时间:2014-05-18 10:37:57    阅读次数:269
LeetCode 017 4Sum
【题目】 Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target? Find all unique quadruplets in the array which gives the sum of target. Note: Elements in a quadruplet (a,b,c,d) must be in non-descending ord...
分类:其他好文   时间:2014-05-18 08:46:04    阅读次数:227
实现精灵沿着圆形轨迹运动
Point pos(100, 100); //start point m_animSprite->setPosition(pos); int count = 8; float radius = 50.f; float angle = 360.f/count; auto array = PointArray::create(count + 1); Point pt0(r...
分类:其他好文   时间:2014-05-18 07:02:31    阅读次数:250
[LeetCode]3Sum Closest
3SumClosest Given an array S of n integers, find three integers in S such that the sum is closest to a given number, target. Return the sum of the three integers. You may assume that each input would have exactly one solution....
分类:其他好文   时间:2014-05-18 05:57:48    阅读次数:244
LeetCode 014 Longest Common Prefix
【题目】 Write a function to find the longest common prefix string amongst an array of strings. 【题意】 求一组字符串的最长公共前缀 【思路】 使用归并思想求解 要求字符串[1,2,..,k,k+1,...n]的最大公共前缀,先分别求[1,2,...k]和[k+1,...,n]的公共前缀...
分类:其他好文   时间:2014-05-18 05:17:53    阅读次数:232
LeetCode 015 3Sum
【题目】 Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique triplets in the array which gives the sum of zero. Note: Elements in a triplet (a,b,c) must be in non-descending order. (ie, a ≤ b ≤ c) The so...
分类:其他好文   时间:2014-05-18 03:15:50    阅读次数:287
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