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LeetCode-204 Count Primes
Count the number of prime numbers less than a non-negative number,n题意:求小于n的所有素数的个数。思路:1. 范围在1~n-1,求先把2的倍数删除,再把3的倍数删除,再把5的倍数删除。。。每次都把集合中最小元素的倍数删除,多次循环之...
分类:其他好文   时间:2015-04-28 17:52:50    阅读次数:112
[LeetCode] Count Primes 质数的个数
Description:Count the number of prime numbers less than a non-negative number,nclick to show more hints.References:How Many Primes Are There?Sieve of ...
分类:其他好文   时间:2015-04-28 15:35:41    阅读次数:144
[LeetCode] Count Primes
Description: Count the number of prime numbers less than a non-negative number, n解题思路采用Eratosthenes筛选法,依次分别去掉2的倍数,3的倍数,5的倍数,……,最后剩下的即为素数。实现代码class Solution { public: int countPrimes(int n) {...
分类:其他好文   时间:2015-04-28 11:54:15    阅读次数:114
logistic regression评价方法
1.sensitivity,也叫recall,true positive rate,含义是预测为正向的case中对的(true positive)和所有事实为正向的case的比例。2.specificity,也叫,true negative rate,含义是预测为负向的case中对的(true ne...
分类:其他好文   时间:2015-04-28 11:25:02    阅读次数:216
[Leetcode] Count Primes
Description:Count the number of prime numbers less than a non-negative number,nHint:The number n could be in the order of 100,000 to 5,000,000.click t...
分类:其他好文   时间:2015-04-27 23:37:49    阅读次数:147
精通负边距
css中的负边距(negative margin)是布局中的一个常用技巧,只要运用得合理常常会有意想不到的效果。很多特殊的css布局方法都依赖于负边距,所以掌握它的用法对于前端的同学来说,那是必须的。本文非常基础,老鸟可以略过。负边距在普通文档流中的作用和效果-影响元素在文档流中的位置那些没有脱离文...
分类:其他好文   时间:2015-04-27 23:22:29    阅读次数:217
HDU 1081 to the max 基础DP 好题
To The MaxProblem DescriptionGiven a two-dimensional array of positive and negative integers, a sub-rectangle is any contiguous sub-...
分类:其他好文   时间:2015-04-27 21:25:15    阅读次数:100
Count Primes
Description:Count the number of prime numbers less than a non-negative number,nHint:The number n could be in the order of 100,000 to 5,000,000.C++实现代码...
分类:其他好文   时间:2015-04-27 21:22:18    阅读次数:92
Leetcode Count Prime
Description:Count the number of prime numbers less than a non-negative number,nHint:The number n could be in the order of 100,000 to 5,000,000.#define...
分类:其他好文   时间:2015-04-27 19:46:35    阅读次数:100
Leetcode Add Two Numbers
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 ...
分类:其他好文   时间:2015-04-27 18:14:10    阅读次数:103
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