wilderness

2017年3月5日

摘要： Given two strings s and t, determine if they are isomorphic. Two strings are isomorphic if the characters in s can be replaced to get t. All occurrenc 阅读全文

posted @ 2017-03-05 20:30 wilderness 阅读(146) 评论(0) 推荐(0)

[leetcode]204. Count Primes

摘要：统计小于n的素数的个数如果判断每一个数是不是素数的话，时间会超时，如下题意要统计素数的个数，那么可以换一种思路，每发现一个素数i，那么i^2，i^2+i...都肯定不是素数阅读全文

posted @ 2017-03-05 19:41 wilderness 阅读(186) 评论(0) 推荐(0)

Here is a 10-line template that can solve most 'substring' problems子字符串问题的模板

摘要：转载自leetcode评论区：https://discuss.leetcode.com/topic/30941/here-is-a-10-line-template-that-can-solve-most-substring-problems I will first give the soluti 阅读全文

posted @ 2017-03-05 11:09 wilderness 阅读(229) 评论(0) 推荐(0)

[leetcode]76. Minimum Window Substring

摘要： Given a string S and a string T, find the minimum window in S which will contain all the characters in T in complexity O(n). For example,S = "ADOBECOD 阅读全文

posted @ 2017-03-05 11:07 wilderness 阅读(139) 评论(0) 推荐(0)

[leetcode]166. Fraction to Recurring Decimal

摘要： Given two integers representing the numerator and denominator of a fraction, return the fraction in string format. If the fractional part is repeating 阅读全文

posted @ 2017-03-05 08:49 wilderness 阅读(132) 评论(0) 推荐(0)

[leetcode]202. 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 intege 阅读全文

posted @ 2017-03-05 00:03 wilderness 阅读(162) 评论(0) 推荐(0)

2017年3月4日

[LeetCode]138. Copy List with Random Pointer

摘要： A linked list is given such that each node contains an additional random pointer which could point to any node in the list or null. Return a deep copy 阅读全文

posted @ 2017-03-04 22:13 wilderness 阅读(175) 评论(0) 推荐(0)

[LeetCode]136. Single Number

摘要： Given an array of integers, every element appears twice except for one. Find that single one. 找出一个数组中唯一一个只出现了一次的数，其余的都出现了两次阅读全文

posted @ 2017-03-04 20:56 wilderness 阅读(114) 评论(0) 推荐(0)

[LeetCode]94. Binary Tree Inorder Traversal

摘要： Given a binary tree, return the inorder traversal of its nodes' values. For example:Given binary tree [1,null,2,3], return [1,3,2]. 题意：中序遍历树先写一种比较蠢的方阅读全文

posted @ 2017-03-04 20:31 wilderness 阅读(152) 评论(0) 推荐(0)

[SQL]197. Rising Temperature

摘要： Given a Weather table, write a SQL query to find all dates' Ids with higher temperature compared to its previous (yesterday's) dates. For example, ret 阅读全文

posted @ 2017-03-04 12:24 wilderness 阅读(212) 评论(0) 推荐(0)

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