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lintcode: ugly number
问题描述Ugly number is a number that only have factors 3, 5 and 7.Design an algorithm to find the Kth ugly number. The first 5 ugly numbers are 3, 5, 7, 9, 15 …问题分析这个题,有多种方法求解,常见的是有辅助数据结构,比如priority_queue,...
分类:其他好文   时间:2015-07-06 01:32:42    阅读次数:533
IOS8添加启动图
在IOS8之后,可以用pdf矢量图添加启动图,昨天下班时没来得及弄,今天早上来试了下。1.Images.xcassets中添加New Launch Image,并命名为Launch Screen,之后设置属性Scale Factors为Single Vector。2.添加LanuchScreen.x...
分类:移动开发   时间:2015-07-02 11:33:50    阅读次数:170
poj 1338 Ugly Numbers
Ugly NumbersTime Limit:1000MSMemory Limit:10000KTotal Submissions:21649Accepted:9680DescriptionUgly numbers are numbers whose only prime factors are 2...
分类:其他好文   时间:2015-06-23 15:17:20    阅读次数:114
POJ 1338 Ugly Numbers
Description Ugly numbers are numbers whose only prime factors are 2, 3 or 5. The sequence  1, 2, 3, 4, 5, 6, 8, 9, 10, 12, ...  shows the first 10 ugly numbers. By convention, 1 is included.  Give...
分类:其他好文   时间:2015-06-18 11:39:10    阅读次数:121
Project Euler:Problem 47 Distinct primes factors
The first two consecutive numbers to have two distinct prime factors are: 14 = 2 × 7 15 = 3 × 5 The first three consecutive numbers to have three distinct prime factors are: 644 = 2² × 7 × 23 ...
分类:其他好文   时间:2015-06-07 11:08:41    阅读次数:106
XTU 1183 Factors
Factors Accepted : 9   Submit : 65 Time Limit : 1000 MS   Memory Limit : 65536 KB 题目描述 从前有个叫天天的熊孩子,他非常喜欢数字1。为什么呢?因为一生二,二生三,三生万物,由此熊孩子认为1是万物之始。现在天天碰到一个问题:有一个正整数集合,...
分类:其他好文   时间:2015-06-07 09:47:05    阅读次数:134
UVa 884 - Factorial Factors
题目:输出n!中素数因数的个数。分析:数论。这里使用欧拉筛法计算素数,在计算过程中求解就可以。 传统筛法是利用每一个素数,筛掉自己的整数倍; 欧拉筛法是利用当前计算出的全部素数,乘以当前数字筛数; 所以每一个前驱的素椅子个数一定比当前数的素因子个数少一个。说明:重新用了...
分类:其他好文   时间:2015-06-02 12:39:51    阅读次数:114
HDU1058——Humble Numbers
Problem DescriptionA number whose only prime factors are 2,3,5 or 7 is called a humble number. The sequence 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 15,...
分类:其他好文   时间:2015-05-29 20:14:10    阅读次数:99
BMP vs GIF vs JPG vs JPEG vs PNG-8 vs PNG-24
原文:http://stackoverflow.com/questions/2336522/png-vs-gif-vs-jpeg-when-best-to-useYou should be aware of a few key factors...First, there are two types...
分类:其他好文   时间:2015-05-27 20:52:37    阅读次数:729
humble number(hd1058)
Problem DescriptionA number whose only prime factors are 2,3,5 or 7 is called a humble number. The sequence 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 15,...
分类:其他好文   时间:2015-05-13 00:42:55    阅读次数:113
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