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leetcode : Count Primes
Description: Count the number of prime numbers less than a non-negative number, n [思路] 素数不能被比它小的整数整除, 建一个boolean 数组, 从2开始, 把其倍数小于N的都删掉. 注意 inner loop从i开始, 比i小的会在以前就被check过. [CODE] pu...
分类:其他好文   时间:2015-04-29 08:43:31    阅读次数:95
[LeetCode 204] Count Primes
题目链接:count-primes Description: Count the number of prime numbers less than a non-negative number, n public class Solution { public int countPrimes(int n) { if(n <= 2) return 0; Lis...
分类:其他好文   时间:2015-04-28 23:02:38    阅读次数:225
【数学】Count Primes
题目:leetcode Count Primes Description: Count the number of prime numbers less than a non-negative number, n 分析: 求出比n小的素数的个数,这个问题可以用排除法做,参考http://www.cnblogs.com/grandyang/p/4462810.html ...
分类:其他好文   时间:2015-04-28 23:01:22    阅读次数:287
leetcode 204题求素数个数
Description: Count the number of prime numbers less than a non-negative number, n   提示晒数法: http://en.wikipedia.org/wiki/Sieve_of_Eratosthenes https://primes.utm.edu/howmany.html   别人的代码:   ...
分类:其他好文   时间:2015-04-28 22:49:39    阅读次数:238
【Add Two Numbers】
题目: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 sing...
分类:其他好文   时间:2015-04-28 22:48:34    阅读次数:167
Java 素数 prime numbers-LeetCode 204
Description:Count the number of prime numbers less than a non-negative number,nclick to show more hints.Credits:Special thanks to@mithmattfor adding t...
分类:编程语言   时间:2015-04-28 22:41:35    阅读次数:184
Count Primes
Description:Count the number of prime numbers less than a non-negative number,nReferences:How Many Primes Are There?Sieve of Eratosthenes由于一个合数总是可以分解成...
分类:其他好文   时间:2015-04-28 22:39:09    阅读次数:164
Java for LeetCode 011 Container With Most Water
Given n non-negative integers a1, a2, ..., an, where each represents a point at coordinate (i, ai). n vertical lines are drawn such that the two endpo...
分类:编程语言   时间:2015-04-28 22:28:27    阅读次数:202
[LeetCode] Count Primes
Count Primes Description: Count the number of prime numbers less than a non-negative number, n 解题思路: 题意为求小于n的质数的个数。有两种方法: 1、naive办法,对小于n的每个数,检查是否为质数。而检查m是否为质数,需要验证是否都不能被2~pow(m, 0.5)整...
分类:其他好文   时间:2015-04-28 21:07:26    阅读次数:155
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
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