LeetCode "448. Find All Numbers Disappeared in an Array"
My first reaction is to have an unlimited length of bit-array, to mark existence. But if no extra mem is allowed, we can simply use 'sign' on each index slot to mark the same info.. it is a common technique.
class Solution {
public:
vector<int> findDisappearedNumbers(vector<int>& nums) {
vector<int> ret;
int n = nums.size();
if(!n) return ret; // Pass 1 - use sign to mark existence.
for(int i = ; i < n; i ++)
{
int inx = abs(nums[i]) - ;
nums[inx] = -abs(nums[inx]);
} // Pass 1 - get all positive
for(int i = ; i < n; i ++)
if(nums[i] > )
ret.push_back(i + ); return ret;
}
};
LeetCode "448. Find All Numbers Disappeared in an Array"的更多相关文章
- LeetCode 448. Find All Numbers Disappeared in an Array (在数组中找到没有出现的数字)
Given an array of integers where 1 ≤ a[i] ≤ n (n = size of array), some elements appear twice and ot ...
- leetcode 448. Find All Numbers Disappeared in an Array -easy (重要)
题目链接: https://leetcode.com/problems/find-all-numbers-disappeared-in-an-array/description/ 题目描述: Give ...
- 5. Leetcode 448. Find All Numbers Disappeared in an Array
Given an array of integers where 1 ≤ a[i] ≤ n (n = size of array), some elements appear twice and ot ...
- LeetCode 448 Find All Numbers Disappeared in an Array 解题报告
题目要求 Given an array of integers where 1 ≤ a[i] ≤ n (n = size of array), some elements appear twice a ...
- LeetCode: 448 Find All Numbers Disappeared in an Array(easy)
题目: Given an array of integers where 1 ≤ a[i] ≤ n (n = size of array), some elements appear twice an ...
- LeetCode 448. Find All Numbers Disappeared in an Array找到所有数组中消失的元素
题目 给定一个范围在 1 ≤ a[i] ≤ n ( n = 数组大小 ) 的 整型数组,数组中的元素一些出现了两次,另一些只出现一次. 找到所有在 [1, n] 范围之间没有出现在数组中的数字. 您能 ...
- [LeetCode] 448. Find All Numbers Disappeared in an Array 找到数组中消失的数字
题目描述 给定n个数字的数组,里面的值都是1-n,但是有的出现了两遍,因此有的没有出现,求没有出现值这个数组中的值有哪些. 要求不能用额外的空间(除了返回列表之外),时间复杂度n 思路 因为不能用额外 ...
- 【leetcode】448. Find All Numbers Disappeared in an Array
problem 448. Find All Numbers Disappeared in an Array solution: class Solution { public: vector<i ...
- leetcode 217. Contains Duplicate 287. Find the Duplicate Number 442. Find All Duplicates in an Array 448. Find All Numbers Disappeared in an Array
后面3个题都是限制在1-n的,所有可以不先排序,可以利用巧方法做.最后两个题几乎一模一样. 217. Contains Duplicate class Solution { public: bool ...
随机推荐
- [ASP.NET MVC] ASP.NET Identity登入技术剖析
[ASP.NET MVC] ASP.NET Identity登入技术剖析 前言 ASP.NET Identity是微软所贡献的开源项目,用来提供ASP.NET的验证.授权等等机制.本篇文章介绍ASP. ...
- (转)SQL 优化原则
一.问题的提出 在应用系统开发初期,由于开发数据库数据比较少,对于查询SQL语句,复杂视图的的编写等体会不出SQL语句各种写法的性能优劣,但是如果将应用 系统提交实际应用后,随着数据库中数据的增加,系 ...
- jQuery动画特效实例教程
本文以实例形式详细讲述了jQuery动画特效的实现方法. 1.自制折叠内容块 内容块如下: <div class="module"> <div cla ...
- iOS BUG: Unbalanced calls to begin/end appearance transitions for <XXXViewController: 0x7fcea3730650>.
自定义TabBarController Push下一级Controller时 会报这样的错误:Unbalanced calls to begin/end appearance transitions ...
- Android Fragment使用(二) 嵌套Fragments (Nested Fragments) 的使用及常见错误
嵌套Fragment的使用及常见错误 嵌套Fragments (Nested Fragments), 是在Fragment内部又添加Fragment. 使用时, 主要要依靠宿主Fragment的 ge ...
- android中的回调请求的个人理解
Fragment类提供了管理"选项菜单"的回调函数onCreateOptionMenu(Menu,MenuInflater),调用它可以--创建"选项菜单". ...
- oc 中组合排序算法
- (NSMutableArray *)zuHeSuanFa:(NSMutableArray *)array chooseCount:(int)m { int n = (int)[array coun ...
- HADOOP安装指南-Ubuntu15.10和hadoop2.7.2
Ubuntu15.10中安装hadoop2.7.2安装手册 太初 目录 1. Hadoop单点模式... 2 1.1 安装步骤... 2 0.环境和版本... 2 1.在ubu ...
- CLR线程概览(下)
作者:施懿民链接:https://zhuanlan.zhihu.com/p/20866017来源:知乎著作权归作者所有.商业转载请联系作者获得授权,非商业转载请注明出处. 同步: 托管代码 托管代码可 ...
- ORA-01950: no privileges on tablespace xxxx
案例场景: 新建了一个表空间后TBS_MARKET_DAT,希望将归档的数据放置在这个表空间. SQL> CREATE TABLESPACE TBS_MARKET_DAT 2 DATAFI ...