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<a href="/2019/05/23/Leetcode283/">Leetcode 题解|283. 移动零</a>
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2019年05月23日
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<p class="brief">
题目
给定一个数组 nums，编写一个函数将所有 0 移动到数组的末尾，同时保持非零元素的相对顺序。
示例 :
输入: [0,1,0,3,12]
输出: [1,3,12,0,0]
说明:
必须在原数组上操作，不能拷贝额外的数组。
尽...
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<a href="/2019/05/17/Leetcode88/">Leetcode 题解|88. 合并两个有序数组</a>
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<div class="post-meta"> •
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2019年05月17日
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<p class="brief">
题目
给定两个有序整数数组 nums1 和 nums2，将 nums2 合并到 nums1 中，使得 num1 成为一个有序数组。
说明:
初始化 nums1 和 nums2 的元素数量分别为 m 和 n。
你可以假设 nums1 ...
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<a href="/2019/05/14/Leetcode66/">Leetcode 题解|66. 加一</a>
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<div class="post-meta"> •
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2019年05月14日
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<p class="brief">
题目
用一个由int类型正整数组成，且元素大于1的数组来表示一个非负整数。实现一个函数对这个非负整数加一。高位在前地位在后，数组中每个元素的范围0~9。且除了整数0以外 [0] ，这个整数不会以零开头。
Simple One:
输入:...
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<a href="/2019/05/13/Leetcode27/">Leetcode 题解|27. 移除元素</a>
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<div class="post-meta"> •
<time class="post-date" datetime="" title="">
2019年05月13日
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<p class="brief">
题目
给定一个数组 nums 和一个值 val，你需要原地移除所有数值等于 val 的元素，返回移除后数组的新长度。
不要使用额外的数组空间，你必须在原地修改输入数组并在使用 O(1) 额外空间的条件下完成。
元素的顺序可以改变。你不...
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<a href="/2019/05/02/Leetcode26/">Leetcode 题解|26. 删除排序数组中的重复项</a>
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<div class="post-meta"> •
<time class="post-date" datetime="" title="">
2019年05月02日
</time>
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<p class="brief">
题目：
给定一个排序数组，你需要在原地删除重复出现的元素，使得每个元素只出现一次，返回移除后数组的新长度。
不要使用额外的数组空间，你必须在原地修改输入数组并在使用 O(1) 额外空间的条件下完成。
示例 1:
给定数组 nums =...
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<a href="/2019/04/30/Leetcode13/">Leetcode 题解|13. 罗马数字转整数</a>
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2019年04月30日
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题目
罗马数字包含以下七种字符: I， V， X， L，C，D 和 M。
字符 数值
I 1
V 5
X 10
L 50...
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题目
判断一个整数是否是回文数。回文数是指正序（从左向右）和倒序（从右向左）读都是一样的整数。
示例 1:
输入: 121
输出: true
示例 2:
输入: -121
输出: false
解释: 从左向右读, 为 -121 。 从...
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题目
给出一个 32 位的有符号整数，你需要将这个整数中每位上的数字进行反转。
示例 1:
输入: 123
输出: 321
示例 2:
输入: -123
输出: -321
示例 3:
输入: 120
输出: 21
注意:
假设我们的环...
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题目
给定一个整数数组 nums 和一个目标值 target，请你在该数组中找出和为目标值的那 两个 整数，并返回他们的数组下标。
你可以假设每种输入只会对应一个答案。但是，你不能重复利用这个数组中同样的元素。
示例 :
给定 num...
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NSOperation的作用
配合使用NSOperation 和 NSOperationQueue也能实现多线程编程
NSOperation和NSOperationQueue实现多线程的具体步骤
现将需要执行的操作封住到一个NSOp...
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