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RSS订阅原创 Leetcode-Combine Sum II
Combination Sum II Total Accepted: 13634 Total Submissions: 55612My Submissions Given a collection of candidate numbers (C) and a target number (T), find all unique combinations in C wher
2014-08-31 11:26:54
392
原创 Best Time to Buy and Sell Stock II
Say you have an array for which the ith element is the price of a given stock on day i. Design an algorithm to find the maximum profit. You may complete as many transactions as you like (ie, buy on
2014-07-13 14:10:33
351
原创 Best Time to Buy and Sell Stock
Say you have an array for which the ith element is the price of a given stock on day i. If you were only permitted to complete at most one transaction (ie, buy one and sell one share of the stock),
2014-07-13 00:20:08
349
原创 4Sum
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 which gives the sum of target. Note: Element
2014-07-13 00:01:10
326
原创 3Sum Closest
Given an array S of n integers, find three integers in S such that the sum is closest to a given number, target. Return the sum of the three integers. You may assume that each input would have exact
2014-07-12 23:52:12
291
原创 Two Sum && 3 Sum
Input: numbers={2, 7, 11, 15}, target=9 Output: index1=1, index2=2 pro： sol：
2014-07-12 23:34:06
325
原创 LRU Cache
Design and implement a data structure for Least Recently Used (LRU) cache. It should support the following operations: get and set. get(key) - Get the value (will always be positive) of the key if
2014-07-12 22:41:52
280
原创 Swap Nodes in Pairs
Given a linked list, swap every two adjacent nodes and return its head. For example, Given 1->2->3->4, you should return the list as 2->1->4->3. Your algorithm should use only constant space. Y
2014-07-12 22:31:46
281
原创 Reverse Nodes in k-Group
Given a linked list, reverse the nodes of a linked list k at a time and return its modified list. If the number of nodes is not a multiple of k then left-out nodes in the end should remain as it is
2014-07-12 21:56:29
328
原创 Remove Nth Node From End of List
Given a linked list, remove the nth node from the end of list and return its head. For example, Given linked list: 1->2->3->4->5, and n = 2. After removing the second node from the end, the
2014-07-12 17:39:05
247
原创 Merge k Sorted Lists
Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity.
2014-07-12 17:21:19
326
原创 Rotate List
Given a list, rotate the list to the right by k places, where k is non-negative. For example: Given 1->2->3->4->5->NULL and k = 2, return 4->5->1->2->3->NULL. pro：给一个lian sol： code：
2014-07-12 16:37:35
337
原创 Reverse Linked List II
Reverse a linked list from position m to n. Do it in-place and in one-pass. For example: Given 1->2->3->4->5->NULL, m = 2 and n = 4, return 1->4->3->2->5->NULL. Note: Given m, n satisfy t
2014-07-12 16:02:22
276
原创 Merge Two Sorted Lists
Merge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes of the first two lists. pro：将两个 sol： code：
2014-07-12 14:25:39
379
原创 Remove Duplicates from Sorted List II
Given a sorted linked list, delete all nodes that have duplicate numbers, leaving only distinct numbers from the original list. For example, Given 1->2->3->3->4->4->5, return 1->2->5. Given 1->1-
2014-07-12 14:14:31
502
原创 Remove Duplicates from Sorted List
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. pro：从排序li sol： code：
2014-07-12 13:42:45
305
原创 Partition List
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
2014-07-12 13:39:13
457
原创 Linked List Cycle I&&II
Given a linked list, determine if it has a cycle in it. Follow up: Can you solve it without using extra space? pro code： /** * Definition for singly-linked list. * struct ListNode {
2014-07-12 11:59:32
321
原创 Leetcode linked list
Insertion Sort List pro:Sort a linked list using insertion sort.
2014-07-12 11:58:43
340
原创 Word Search
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
2014-07-12 00:03:25
424
原创 Surrounded Regions
pro:给一个图，图包含'X'和‘O’，将图中所有的被包围的'O'置为‘X’，被包围的意思是周围都是'X',没有到边界。 sol:有两个做法 做法1：从每一个没被访问过的'O'开始，bfs或dfs，记录下这次有没有通过某个‘O’到达了边界，有的话就是不能置为'X'的，没有的话就能 做法2：逆向思维，从矩阵的四边找，扩展所有能扩展的'O'.剩下的就是被包围的 此题网页1A，awesome！
2014-07-11 23:55:12
296
原创 Word Ladder II
Given two words (start and end), and a dictionary, find all shortest transformation sequence(s) from start to end, such that: Only one letter can be changed at a timeEach intermediate word must exi
2014-07-11 23:49:56
571
原创 word ladder
Given two words (start and end), and a dictionary, find the length of shortest transformation sequence from start to end, such that: Only one letter can be changed at a timeEach intermediate word
2014-07-11 22:57:09
324
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