随笔分类 -  Leetcode

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Rotate Image
摘要：You are given annxn2D matrix representing an image.Rotate the image by 90 degrees (clockwise).Follow up:Could you do this in-place?分析：先沿对角线进行对折，然后沿水平中... 阅读全文
posted @ 2015-05-13 23:23 amazingzoe 阅读(141) 评论(0) 推荐(0)
Valid Sudoku
摘要：Determine if a Sudoku is valid, according to:Sudoku Puzzles - The Rules.The Sudoku board could be partially filled, where empty cells are filled with ... 阅读全文
posted @ 2015-05-13 17:02 amazingzoe 阅读(173) 评论(0) 推荐(0)
Permutation Sequence
摘要：The set[1,2,3,…,n]contains a total ofn! unique permutations.By listing and labeling all of the permutations in order,We get the following sequence (ie... 阅读全文
posted @ 2015-05-13 16:26 amazingzoe 阅读(118) 评论(0) 推荐(0)
Next Permutation
摘要：Implement next permutation, which rearranges numbers into the lexicographically next greater permutation of numbers.If such arrangement is not possibl... 阅读全文
posted @ 2015-05-12 23:15 amazingzoe 阅读(166) 评论(0) 推荐(0)
3Sum Closest
摘要：Given an arraySofnintegers, find three integers inSsuch that the sum is closest to a given number, target. Return the sum of the three integers. You m... 阅读全文
posted @ 2015-05-11 17:39 amazingzoe 阅读(178) 评论(0) 推荐(0)
4Sum
摘要：Given an arraySofnintegers, are there elementsa,b,c, anddinSsuch thata+b+c+d= target? Find all unique quadruplets in the array which gives the sum of ... 阅读全文
posted @ 2015-05-11 16:52 amazingzoe 阅读(160) 评论(0) 推荐(0)
3Sum
摘要：Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique triplets in the array which gives the sum of 阅读全文
posted @ 2015-05-11 13:37 amazingzoe 阅读(162) 评论(0) 推荐(0)
Two Sum
摘要：Given an array of integers, find two numbers such that they add up to a specific target number.The function twoSum should return indices of the two nu... 阅读全文
posted @ 2015-05-11 11:03 amazingzoe 阅读(109) 评论(0) 推荐(0)
Longest Consecutive Sequence
摘要：Given an unsorted array of integers, find the length of the longest consecutive elements sequence.For example,Given[100, 4, 200, 1, 3, 2],The longest ... 阅读全文
posted @ 2015-05-11 10:31 amazingzoe 阅读(123) 评论(0) 推荐(0)
Median of Two Sorted Arrays
摘要：There are two sorted arraysnums1andnums2of size m and n respectively. Find the median of the two sorted arrays. The overall run time complexity should... 阅读全文
posted @ 2015-05-10 19:22 amazingzoe 阅读(154) 评论(0) 推荐(0)
Bitwise AND of Numbers Range
摘要：Given a range [m, n] where 0 m位数，一定会出现100…0的情况，AND的结果为100…00如果n位数=m位数，从最高位开始分析，如果n和m该位上的数字相等，考虑下一位，直到某位上n=1，m=0（因为n>m）。到这种情况时，一定又会出现100…0的情况，所以后面的这些数字... 阅读全文
posted @ 2015-05-09 16:59 amazingzoe 阅读(122) 评论(0) 推荐(0)
Happy Number
摘要：Write an algorithm to determine if a number is "happy".A happy number is a number defined by the following process: Starting with any positive integer... 阅读全文
posted @ 2015-05-09 13:41 amazingzoe 阅读(235) 评论(0) 推荐(0)
Count Primes
摘要：Description:Count the number of prime numbers less than a non-negative number,nclick to show more hints.References:How Many Primes Are There?Sieve of ... 阅读全文
posted @ 2015-05-09 12:21 amazingzoe 阅读(138) 评论(0) 推荐(0)
Reverse Linked List****
摘要：Reverse a singly linked list.click to show more hints.Hint:A linked list can be reversed either iteratively or recursively. Could you implement both?分... 阅读全文
posted @ 2015-05-08 23:50 amazingzoe 阅读(166) 评论(0) 推荐(0)
Search in Rotated Sorted Array II
摘要：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 functio 阅读全文
posted @ 2015-04-29 16:57 amazingzoe 阅读(113) 评论(0) 推荐(0)
Search in Rotated Sorted Array
摘要：Suppose a sorted array is rotated at some pivot unknown to you beforehand. (i.e., 0 1 2 4 5 6 7 might become 4 5 6 7 0 1 2). You are given a target va 阅读全文
posted @ 2015-04-29 16:22 amazingzoe 阅读(122) 评论(0) 推荐(0)
Remove Duplicates from Sorted List II
摘要：Given a sorted linked list, delete all nodes that have duplicate numbers, leaving onlydistinctnumbers from the original list.For example,Given1->2->3-... 阅读全文
posted @ 2015-04-28 17:31 amazingzoe 阅读(102) 评论(0) 推荐(0)
Remove Duplicates from Sorted List
摘要：Given a sorted linked list, delete all duplicates such that each element appear onlyonce.For example,Given1->1->2, return1->2.Given1->1->2->3->3, retu... 阅读全文
posted @ 2015-04-28 16:39 amazingzoe 阅读(110) 评论(0) 推荐(0)
Remove Duplicates from Sorted Array II
摘要：Follow up for "Remove Duplicates":What if duplicates are allowed at mosttwice?For example,Given sorted array A =[1,1,1,2,2,3],Your function should ret... 阅读全文
posted @ 2015-04-28 16:31 amazingzoe 阅读(89) 评论(0) 推荐(0)
Remove Duplicates from Sorted Array
摘要：Given a sorted array, remove the duplicates in place such that each element appear onlyonceand return the new length.Do not allocate extra space for a... 阅读全文
posted @ 2015-04-28 10:33 amazingzoe 阅读(118) 评论(0) 推荐(0)

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