这是悦乐书的第232次更新,第245篇原创 01 看题和准备 今天介绍的是LeetCode算法题中Easy级别的第99题(顺位题号是448).给定一个整数数组,其中1≤a[i]≤n(n =数组的大小),一些元素出现两次,其他元素出现一次.找到[1,n]包含的所有元素,这些元素不会出现在此数组中.你可以在没有额外空间和O(n)运行时的情况下完成吗? 您可以假设返回的列表不计入额外空间.例如: 输入:[4,3,2,7,8,2,3,1] 输出:[5,6] 本次解题使用的开发工具是eclipse,jdk…

题目:整数数组满足1<=a[i]<=n(n是数组的长度),某些元素出现一次,某些元素出现两次,在数组a[i]中找到[1,n]区间中未出现的数字.比如输入[4,3,2,7,8,2,3,1],输出[5,6].时间复杂度要求是O(n),空间复杂度要求O(1) 思路:看许多网友说用set数据结构去做,这就违反了空间复杂度的要求,所以排序还是要本地做的.遍历数组,把这个数字放到它该待的地方:比如a[0]=4,那么我们就把4放到a[3]处,然后把a[3]处的7放到a[6]处,把a[6]处3放在a[2]处,…

问题来源:Find All Numbers Disappeared in an Array 很久没有刷题了,感觉大脑开始迟钝,所以决定重拾刷题的乐趣.一开始不要太难,选一些通过率高的题目做,然后就看到了这个题目.我有些吃惊,这个题我虽然知道两种解法,但本身还是有难度的,居然通过率这么高.然后就搜索相关网页,看到一个和它很接近的题目<Find All Duplicates in an Array>,然后就释然了.这两个题目有相同的题干,只是问题略微不同,解法有相似之处.估计是因为题号太接近了,会…

题目: 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 others appear once. Find all the elements of [1, n] inclusive that do not appear in this array. Could…

problem 448. Find All Numbers Disappeared in an Array solution: class Solution { public: vector<int> findDisappearedNumbers(vector<int>& nums) { vector<int> res; ; i<nums.size(); i++) { ; nums[tmp] = nums[tmp]> ? -nums[tmp] : n…

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 containsDuplicate(vector<int>& nums) { int length = nums.size(); ) return false; sort(nums.begin(),nums.end()); ;i < length;i++){ ]) return tr…

LeetCode--Find All Numbers Disappeared in an Array Question Given an array of integers where 1 ≤ a[i] ≤ n (n = size of array), some elements appear twice and others appear once. Find all the elements of [1, n] inclusive that do not appear in this arr…

448. Find All Numbers Disappeared in an Array[easy] Given an array of integers where 1 ≤ a[i] ≤ n (n = size of array), some elements appear twice and others appear once. Find all the elements of [1, n] inclusive that do not appear in this array. Coul…

Given an array of integers where 1 ≤ a[i] ≤ n (n = size of array), some elements appear twice and others appear once. Find all the elements of [1, n] inclusive that do not appear in this array. Could you do it without extra space and in O(n) runtime?…

448. Find All Numbers Disappeared in an Array Easy Given an array of integers where 1 ≤ a[i] ≤ n (n = size of array), some elements appear twice and others appear once. Find all the elements of [1, n] inclusive that do not appear in this array. Could…