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목록전체 글 (112)
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Given the head of a linked list, return the list after sorting it in ascending order. Follow up: Can you sort the linked list in O(n logn) time and O(1) memory (i.e. constant space)? Example 1: Input: head = [4,2,1,3] Output: [1,2,3,4] Example 2: Input: head = [-1,5,3,4,0] Output: [-1,0,3,4,5] Example 3: Input: head = [] Output: [] Constraints: The number of nodes in the list is in the range [0,..
Given an integer array nums, reorder it such that nums[0] nums[2] < nums[3].... You may assume the input array always has a valid answer. Example 1: Input: nums = [1,5,1,1,6,4] Output: [1,6,1,5,1,4] Explanation: [1,4,1,5,1,6] is also accepted. Example 2: Input: nums = [1,3,2,2,3,1] Output: [2,3,1,3,1,2] Constraints: 1
There are 3n piles of coins of varying size, you and your friends will take piles of coins as follows: In each step, you will choose any 3 piles of coins (not necessarily consecutive). Of your choice, Alice will pick the pile with the maximum number of coins. You will pick the next pile with maximum number of coins. Your friend Bob will pick the last pile. Repeat until there are no more piles of..
A string S of lowercase English letters is given. We want to partition this string into as many parts as possible so that each letter appears in at most one part, and return a list of integers representing the size of these parts. Example 1: Input: S = "ababcbacadefegdehijhklij" Output: [9,7,8] Explanation: The partition is "ababcbaca", "defegde", "hijhklij". This is a partition so that each let..
A sequence of numbers is called arithmetic if it consists of at least two elements, and the difference between every two consecutive elements is the same. More formally, a sequence s is arithmetic if and only if s[i+1] - s[i] == s[1] - s[0] for all valid i. For example, these are arithmetic sequences: 1, 3, 5, 7, 9 7, 7, 7, 7 3, -1, -5, -9 The following sequence is not arithmetic: 1, 1, 2, 5, 7 ..