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Given an array with n objects colored red, white or blue, sort them so that objects of the same color are adjacent, with the colors in the order red, 阅读全文
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Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target? Find all unique quadruplets in the array whic 阅读全文
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Sort a linked list in O(n log n) time using constant space complexity. 题目要求给定时间复杂度对链表进行排序，但是我个人认为题目要求不是很合理，使用归并排序时间复杂度满足要求，但是空间复杂度并不为常数，所以个人认为这道题不严谨，说 阅读全文
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Sort a linked list using insertion sort. 讲真，很久没做这么累的链表题目了，这道题折腾了我很久，说实话，最后改来改去，自己还是一知半解，这道题折腾了我一天多，实在是累。实在是搞不懂出这道题的人脑子里面究竟在想什么，注意一个问题，这道题和之前链表题目的不同之处在 阅读全文
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Given a linked list, return the node where the cycle begins. If there is no cycle, return null. Note: Do not modify the linked list. Follow up:Can you 阅读全文
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Given a singly linked list, determine if it is a palindrome. Follow up:Could you do it in O(n) time and O(1) space? Given a singly linked list, determ 阅读全文
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Given a singly linked list, group all odd nodes together followed by the even nodes. Please note here we are talking about the node number and not the 阅读全文
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Reverse a singly linked list. click to show more hints. Hint: A linked list can be reversed either iteratively or recursively. Could you implement bot 阅读全文
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Write a program to find the node at which the intersection of two singly linked lists begins. For example, the following two linked lists: begin to in 阅读全文
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Write a function to delete a node (except the tail) in a singly linked list, given only access to that node. Supposed the linked list is 1 -> 2 -> 3 - 阅读全文