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? You may assume the returne...
classSolution{public:vector<int>findDisappearedNumbers(vector<int>& nums){intn = nums.size();inti =0;while(i < n){if(nums[i] == i +1){// right posi++; }else{if(nums[i] == nums[nums[i] -1]){// needn't swapi++; }else{swap(nums[i], nums[nums[i]-1]); } } } v...
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? You may assume the ...
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? You may assume the ...
Find all Missing Numbers (easy) Find the Duplicate Number (easy) Find all Duplicate Numbers (easy) 6. Pattern: In-place Reversal of a LinkedList,链表翻转 在众多问题中,题目可能需要你去翻转链表中某一段的节点。通常,要求都是你得原地翻转,就是重复使用这些已经建好的节点,而不使用额外的空间。这个时...
Can you solve this real interview question? Find All Numbers Disappeared in an Array - Given an array nums of n integers where nums[i] is in the range [1, n], return an array of all the integers in the range [1, n] that do not appear in nums. Example
Runtime:75 ms, faster than58.11%of Java online submissions for Find All Lonely Numbers in the Array. Memory Usage:63.7 MB, less than79.80%of Java online submissions for Find All Lonely Numbers in the Array.
https://leetcode.cn/problems/number-of-ways-to-separate-numbers 一个“非递减”的限制让这道题直接从水题变成难度分2800+的超模怪。状态转移方程看上去不算复杂,但如果暴力转移,时间复杂度达到了n^3,必须注意到相邻状态有大量重复项,来用前缀和来优化。另外数字位数相同并不代表一定能转移,数字位数相同时哪些...
Find the Missing Number (easy) Find all Missing Numbers (easy) Find the Duplicate Number (easy) Find all Duplicate Numbers (easy) 6. Pattern: In-place Reversal of a LinkedList,链表翻转 在众多问题中,题目可能需要你去翻转链表中某一段的节点。通常,要求都是你得原地翻转,就是重复使用这些已经建好的...
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