*442. Find All Duplicates in an Array 思路一:使用数组下标标记,所以现在把数组下标,当成数组中的元素,如果下标对应的value为正数,表示出现了偶数次,为负数表示出现了奇数次 所以,可以遍历一遍数组,然后根据数组中,值对应的数组元素是正数还是负数,把偶数的元素搞出来,在使用set做下去重,最后输出array 思路二:思路...
Given an integer arraynumswhich is sorted in ascending order and all of its elements are unique and given also an integerk, return thekthmissing number starting from the leftmost number of the array. Example 1: Input: nums = [4,7,9,10], k = 1 Output: 5 Explanation: The first missing...
27. Remove Element Given an array nums and a value val, remove all instances of that value in-place and return the new length.Do not allocate extra space for another array, you must do this by modifying the input array in-place with O(1) extra memory. 题目要求:这道题让我们移除一个数...
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: The solution set must not contain duplicate triplets. For example, given array S = [-1, 0, 1, 2, -...
Notice that x does not have to be an element in nums. Return x if the array is special, otherwise, return -1. It can be proven that if nums is special, the value for x is unique. Example 1: Input: nums = [3,5] Output: 2 ...
The robot can only move either down or right at any point in time. The robot is trying to reach the bottom-right corner of the grid (marked ‘Finish’ in the diagram below). How many possible unique paths are there? Above is a 7 x 3 grid. How many possible unique paths are there...
kis in the range[1, the number of unique elements in the array]. It is guaranteed that the answer is unique. Follow up: Your algorithm's time complexity must be better thanO(n log n), where n is the array's size. Ideas: 1. 利用collections.Counter(), 得到num: countNum 的dictionary...
题目:Given an arraySofnintegers, are there elementsa,b,cinSsuch thata+b+c= 0? Find all unique triplets in the array which gives the sum of zero. Note: The solution set must not contain duplicate triplets. For example, given array S = [-1, 0, 1, 2, -1, -4], A solution set ...
给你一个下标从 0 开始的整数数组 nums ,该数组的大小为 n ,请你计算 nums[j] - nums[i] 能求得的 最大差值 ,其中 0 <= i < j < n 且 nums[i] < nums[j] 。 返回 最大差值 。如果不存在满足要求的 i 和 j ,返回 -1 。 示例1: ...
215 Kth Largest Element in an Array 27.4% Medium 214 Shortest Palindrome 16.3% Hard 213 House Robber II 26.1% Medium 212 Word Search II 15.0% Hard 211 Add and Search Word – Data structure design 20.9% Medium 210 Course Schedule II 19.1% Medium 209 Minimum Size Subarray Sum 23.1% Medium ...