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156. Binary Tree Upside Down Given a binary tree where all the right nodes are either leaf nodes with a sibling (a left node that shares the same pare 阅读全文
posted @ 2016-12-30 07:17
Gryffin
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图论的常见题目有两类，一类是求两点间最短距离，另一类是拓扑排序，两种写起来都很烦。 求最短路径： 127. Word Ladder Given two words (beginWord and endWord), and a dictionary's word list, find the leng 阅读全文
posted @ 2016-12-29 12:23
Gryffin
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12. Integer to Roman Given an integer, convert it to a roman numeral. Input is guaranteed to be within the range from 1 to 3999. [leetcode] 12. Intege 阅读全文
posted @ 2016-12-29 10:30
Gryffin
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94. Binary Tree Inorder Traversal Given a binary tree, return the inorder traversal of its nodes' values. For example:Given binary tree [1,null,2,3], 阅读全文
posted @ 2016-12-29 09:19
Gryffin
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1. 普通的二分法查找查找等于target的数字 2. 还可以查找小于target的数字中最小的数字和大于target的数字中最大的数字 由于新的查找结果总是比旧的查找结果更接近于target，因此只需不停更新result 3. 查找最接近于target的数字 这种情况下，新的查找结果不一定比旧的查 阅读全文
posted @ 2016-12-29 05:18
Gryffin
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链表： 61. 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,r 阅读全文
posted @ 2016-12-29 05:13
Gryffin
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75. Sort Colors 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 阅读全文
posted @ 2016-12-29 04:36
Gryffin
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71. Simplify Path Given an absolute path for a file (Unix-style), simplify it. For example,path = "/home/", => "/home"path = "/a/./b/../../c/", => "/c 阅读全文
posted @ 2016-12-29 03:47
Gryffin
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动态规划属于技巧性比较强的题目，如果看到过原题的话，对解题很有帮助 55. Jump Game Given an array of non-negative integers, you are initially positioned at the first index of the array. 阅读全文
posted @ 2016-12-28 23:23
Gryffin
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一般用dfs来做 最简单的一种： 17. Letter Combinations of a Phone Number Given a digit string, return all possible letter combinations that the number could represe 阅读全文
posted @ 2016-12-28 12:12
Gryffin
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