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[leetcode]_Roman to Integer
题目:给定一个罗马数字串,转换为一个整数。一开始没理解,以为是string to int。后来理解:罗马数字与阿拉伯数字的映射关系,见下图:至此,题目的意思才掌握明白,用程序模拟这张表。无可置否,需要将这张表的映射关系存进一个map中,对输入的string查找map中的映射关系。先贴上代码:(注:s...
分类:其他好文   时间:2014-05-19 21:15:15    阅读次数:295
[leetcode]_Longest Common Prefix
问题:寻找最长公共前缀思路:就是逐一检查每个string中的每一位,碰到不相等的时候,结束;每个string中这一位都相等,加入到common prefix中~public String longestCommonPrefix(String[] strs) { int ...
分类:其他好文   时间:2014-05-19 21:12:05    阅读次数:292
[leetcode]_Remove Nth Node From End of List
题目:移除linked-list从尾到头的第N个元素自我思路:因为题目给出的N是从链表尾开始计算的,单链表不存在从子指向父亲的反向指针,因此我先计算链表的整个长度len,然后用len - N来表示正向被删除元素所在的位置。代码:public ListNode removeNthFromEnd(Lis...
分类:其他好文   时间:2014-05-19 20:54:33    阅读次数:378
[LeetCode] [Balanced Binary Tree 2012-10-08 ]
Given a binary tree, determine if it is height-balanced.For this problem, a height-balanced binary tree is defined as a binary tree in which the depth...
分类:其他好文   时间:2014-05-19 20:40:55    阅读次数:278
【leetcode】Partition List
Given a linked list and a valuex, partition it such that all nodes less thanxcome before nodes greater than or equal tox.You should preserve the origi...
分类:其他好文   时间:2014-05-19 11:38:43    阅读次数:246
Leetcode | 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 removi...
分类:其他好文   时间:2014-05-19 09:16:49    阅读次数:247
【LeetCode】Jump Game
Given an array of non-negative integers, you are initially positioned at the first index of the array.Each element in the array represents your maximu...
分类:其他好文   时间:2014-05-19 08:23:07    阅读次数:223
【LeetCode】Jump Game II
Given an array of non-negative integers, you are initially positioned at the first index of the array.Each element in the array represents your maximu...
分类:其他好文   时间:2014-05-19 08:07:26    阅读次数:288
[leetcode]_Merge Two Sorted Lists
题目:合并两个有序单链表思路:一开始想复杂了,以为必须在原链表上修改(绕来绕去还AC了,但是思路相当绕),其实没有,按照正常地合并两个数组同样的方法也对。代码:public ListNode mergeTwoLists(ListNode l1, ListNode l2) { if(l1 ...
分类:其他好文   时间:2014-05-19 07:48:32    阅读次数:314
Leetcode | Validate Binary Search Tree
Given a binary tree, determine if it is a valid binary search tree (BST).Assume a BST is defined as follows:The left subtree of a node contains only n...
分类:其他好文   时间:2014-05-19 07:23:48    阅读次数:357
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