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LeetCode: Remove Duplicates from Sorted Array II [080]
【题目】 Follow up for "Remove Duplicates": What if duplicates are allowed at most twice? For example, Given sorted array A = [1,1,1,2,2,3], Your function should return length = 5, and A is now [1,1,2,2,3]. 【题意】 给定一个有序数组,给数组去重,和Remove Duplicates from...
分类:其他好文   时间:2014-06-03 05:36:24    阅读次数:219
LeetCode: Remove Duplicates from Sorted List [082]
【题目】 Given a sorted linked list, delete all duplicates such that each element appear only once. For example, Given 1->1->2, return 1->2. Given 1->1->2->3->3, return 1->2->3. 【题意】 给定一个已排序的链表,删除其中的重复元素 【思路】 维护两个指针prev和cur, cur指针负责扫描链表,prev指向cur的前一...
分类:其他好文   时间:2014-06-03 04:05:39    阅读次数:231
leetcode -day23 Construct Binary Tree from Inorder and Postorder Traversal & Construct Binary Tree f
1、 ?? Construct Binary Tree from Inorder and Postorder Traversal Given inorder and postorder traversal of a tree, construct the binary tree. Note: You may assume that duplicates do not exist in...
分类:其他好文   时间:2014-06-03 03:13:59    阅读次数:195
LeetCode:Reorder List
Given a singly linked list L: L0→L1→…→Ln-1→Ln, reorder it to: L0→Ln→L1→Ln-1→L2→Ln-2→…   You must do this in-place without altering the nodes' values.   For example, Given {1,2,3,4}, r...
分类:其他好文   时间:2014-06-03 03:12:46    阅读次数:222
LeetCode: Search in Rotated Sorted Array II [081]
【题目】 Follow up for "Search in Rotated Sorted Array": What if duplicates are allowed? Would this affect the run-time complexity? How and why? Write a function to determine if a given target is in the array. 【题意】 在“Search in Rotated Sorted Array”的基...
分类:其他好文   时间:2014-06-03 01:55:38    阅读次数:173
LeetCode: Word Search [079]
【题目】 Given a 2D board and a word, find if the word exists in the grid. The word can be constructed from letters of sequentially adjacent cell, where "adjacent" cells are those horizontally or vertically neighboring. The same letter cell may not be use...
分类:其他好文   时间:2014-06-03 01:07:58    阅读次数:329
LeetCode: Partition List [086]
【题目】 Given a linked list and a value x, partition it such that all nodes less than x come before nodes greater than or equal to x. You should preserve the original relative order of the nodes in each of the two partitions. For example, Given 1->4->3-...
分类:其他好文   时间:2014-06-03 00:02:29    阅读次数:270
【leetcode】 Longest Substring Without Repeating Characters
题目: 给定一个字符串,返回该串没有重复字符的最长子串。 分析: 1)子串:子串要求是连续的。 2)无重复,出现重复就断了,必须从新的位置开始。而新的位置就是重复字符第一次出现位置的下一个位置。 3)整个串可能没有一处重复。 那么,为了找出当前访问的字符是否出现过,要怎么做呢?当然是hash,O(1)的时间,而且既然是字符, 定义个255的hash table 就可以了,has...
分类:其他好文   时间:2014-06-01 10:48:31    阅读次数:206
leetCode解题报告5道题(九)
题目一:CombinationsGiven two integersnandk, return all possible combinations ofknumbers out of 1 ...n.For example,Ifn= 4 andk= 2, a solution is:[ [2,4],....
分类:其他好文   时间:2014-05-31 20:01:02    阅读次数:455
北京邀请赛 H. Happy Reversal
题意:给你一些二进制的数,然后你可以选择按位取反,也可以不变,你只能选择一种,然后让你找出最大和最小,求最大的差值 思路:将取反与不取反都算出来,然后大的放一边,小的放一边,排序后判断#include #include #include #include #define ll long long using namespace std; const int MAXN = 100010; ...
分类:移动开发   时间:2014-05-31 17:44:07    阅读次数:321
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