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[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
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
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
[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] 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
判断小于n数中素数的个数,如果用普通的判断方法会超时,这里使用筛选法。 具体请参考:http://blog.csdn.net/liukehua123/article/details/5482854public class Solution { public int countPrimes(i...
分类:其他好文   时间:2015-04-28 01:39:20    阅读次数:120
Count Primes Total Accepted: 831 Total Submissions: 6167
题目来自:Leetcode https://leetcode.com/problems/count-primes/ Count Primes  Total Accepted: 831 Total Submissions: 6167My Submissions Question  Solution  Description: ...
分类:其他好文   时间:2015-04-27 23:50:05    阅读次数:174
leetcode - Count Primes
leetcode -https://leetcode.com/problems/count-primes/Q:Description:Count the number of prime numbers less than a non-negative number,nHint:The number ...
分类:其他好文   时间:2015-04-27 18:10:59    阅读次数:230
2 UVA 10394 Twin Primes
直接筛素数预处理。 #include #include #include using namespace std; const int maxn=20000000; bool pri[20000005]; vector v; void init() { int i,j; memset(pri,1,sizeof pri); pri[0]=pri[1]=0; ...
分类:Windows程序   时间:2015-04-26 22:56:15    阅读次数:227
POJ 3132 Sum of Different Primes ( 满背包问题)
Sum of Different PrimesTime Limit:5000MSMemory Limit:65536KTotal Submissions:3280Accepted:2040DescriptionA positive integer may be expressed as a sum ...
分类:其他好文   时间:2015-04-22 01:46:36    阅读次数:169
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