You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as a link...
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其他好文 时间:
2014-05-23 07:43:23
阅读次数:
246
1、
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Convert Sorted List to Binary Search Tree
Given a singly linked list where elements are sorted in ascending order, convert it to a height balanced BST.
分析:将一个升序排列的链表转换为平衡二叉搜索树,采用递归的方式,先找到链表...
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其他好文 时间:
2014-05-22 12:33:30
阅读次数:
270
Remove Nth Node From End of List删除链表倒数的第N个元素...
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其他好文 时间:
2014-05-22 11:15:52
阅读次数:
170
【题目】
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 the character '.'.
A partially filled sudoku which is valid.
Note:
A valid Sudoku board (par...
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其他好文 时间:
2014-05-22 09:58:54
阅读次数:
234
Letter Combinations of a Phone Number
DFS BFS...
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其他好文 时间:
2014-05-22 09:23:16
阅读次数:
267
5道题目分别是:【Subsets】、【Subsets II】、【Unique Paths】、【Unique Paths II】、【Trapping Rain Water 】,由于有一些题目不需要发一整篇博文来记录,所以就将这些题目以一篇博文5道来记录。...
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其他好文 时间:
2014-05-22 08:35:03
阅读次数:
348
【题目】
Write a program to solve a Sudoku puzzle by filling the empty cells.
Empty cells are indicated by the character '.'.
You may assume that there will be only one unique solution.
A sudoku puzzle...
...and its solution numbers marked in red.
...
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其他好文 时间:
2014-05-20 17:07:34
阅读次数:
335
题目:
Given an array of integers, every element appears
three times except for one. Find that single one.
Note:
Your algorithm should have a linear runtime complexity. Could you implem...
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其他好文 时间:
2014-05-20 16:22:52
阅读次数:
241
POJ 2773 Happy 2006
题目大意:
给定m,k,问你第K个与m互质的数是多少? 其中 m (1 <= m <= 1000000), K (1 <= K <= 100000000).
解题思路:
用位运算的容斥原理,计算 [1,x]与m互质的数的方法是:
假设 m的质因数为 a,b,c ,那么与m不互斥的数个数为 f(a)+f(b)+f(c)-f(ab)-f(ac)-fa(bc)+f(abc),f(t)的含义是 (1,x)有多少个数与t不互质,很明显f(t)=x/t,那么与m互...
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移动开发 时间:
2014-05-20 13:50:30
阅读次数:
291
戳我去解题Given a linked list, remove thenthnode from
the end of list and return its head.For example, Given linked list:
1->2->3->4->5, and n = 2. Aft...
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其他好文 时间:
2014-05-20 08:04:28
阅读次数:
291