【题目】
Given a binary tree and a sum, find all root-to-leaf paths where each path's sum equals the given sum.
For example:
Given the below binary tree and sum = 22,
5
/ 4 8
/ / 11 13 4
...
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其他好文 时间:
2014-06-20 10:53:08
阅读次数:
181
n! means n (n
1)
...
3
2
1
For example, 10! = 10 9
...
3
2
1 = 3628800,
and the sum of the digits in the number 10! is 3 + 6 + 2 + 8 + 8 + 0 + 0 = 27.
Find the sum of the digits...
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其他好文 时间:
2014-06-20 09:34:10
阅读次数:
215
Enumerations and Structures
Enumerations 枚举的使用
使用 enum 定义一个枚举,枚举里面可以关联方法,比如下文中的描述方法
enum Rank: Int {
case Ace = 1
case Two, Three, Four, Five, Six, Seven, Eight, Nine, Ten
case Ja...
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其他好文 时间:
2014-06-20 09:03:39
阅读次数:
322
【题目】
Given a binary tree and a sum, determine if the tree has a root-to-leaf path such that adding up all the values along the path equals the given sum.
For example:
Given the below binary tree and sum = 22,
5
/ ...
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其他好文 时间:
2014-06-07 13:57:37
阅读次数:
210
By starting at the top of the triangle below and moving to adjacent numbers on the row below, the maximum total from top to bottom is 23.
3
7 4
2 4 6
8 5 9 3
That is, 3 + 7 + 4 + 9 = 23.
Find th...
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其他好文 时间:
2014-06-07 13:45:25
阅读次数:
189
Let d(n) be defined as the sum of proper divisors of n (numbers less than
n which divide evenly into n).
If d(a) = b and d(b) = a, where a
b, then a and b are an amicable pair and each of a and
b...
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其他好文 时间:
2014-06-07 13:40:53
阅读次数:
226
二维码:二维码(Two-dimensional
code),又称二维条码,它是用特定的几何图形按一定规律在平面(二维方向)上分布的黑白相间的图形,是所有信息数据的一把钥匙。在现代商业活动中,可实现的应用十分广泛,如:产品防伪/溯源、广告推送、网站链接、数据下载、商品交易、定位/导航、电子凭证、车辆管...
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其他好文 时间:
2014-06-07 08:05:10
阅读次数:
269
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...
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其他好文 时间:
2014-06-05 14:15:07
阅读次数:
221
Given two binary strings, return their sum
(also a binary string).For example,a ="11"b ="1"Return"100".public class
Solution { /**The program is us...
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其他好文 时间:
2014-06-05 14:08:35
阅读次数:
188
Given a linked list, swap every two adjacent
nodes and return its head.For example,Given1->2->3->4, you should
return the list as2->1->4->3.Your algor...
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其他好文 时间:
2014-06-05 13:41:44
阅读次数:
231