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Given a singly-linked list, where each node contains an integer value, sort it in ascending order. The merge sort algorithm should be used to solve this problem. Examples null, is sorted to null 1 -> null, is sorted to 1 -> null 1 -> 2 -> 3

Given a linked list, check whether it is a palindrome. Examples: Input: 1 -> 2 -> 3 -> 2 -> 1 -> null output: true. Input: 1 -> 2-> 3-> null output: false. Requirements: Space complexity must be O(1) 思路：找到中点，在reverse...

Given a composition with different kinds of words, return a list of the top K most frequent words in the composition. Assumptions the composition is not null and is not guaranteed to be sorted K >= 1andK could be larger than the number of distinct ..

https://blog.youkuaiyun.com/ToraNe/article/details/103003531

Given an array of integers, sort the elements in the array in ascending order. The quicksort algorithm should be used to solve this problem. Examples {1} is sorted to {1} {1, 2, 3} is sorted to {1, 2, 3} {3, 2, 1} is sorted to {1, 2, 3} {4, 2, -3, 6,.

Given an integerx, returntrueifxis palindrome integer. An integer is apalindromewhen it reads the same backward as forward. For example,121is palindrome while123is not. Example 1: Input: x = 121 Output: true Example 2: Input: x = -121...

Roman numerals are represented by seven different symbols:I,V,X,L,C,DandM. Symbol Value I 1 V 5 X 10 L 50 C 100 D 500 M 1000 For example,2is written asI...