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...
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其他好文 时间:
2015-04-28 23:02:38
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225
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:
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其他好文 时间:
2015-04-28 22:49:39
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238
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...
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其他好文 时间:
2015-04-28 22:39:09
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164
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...
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其他好文 时间:
2015-04-28 21:07:26
阅读次数:
155
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 ...
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其他好文 时间:
2015-04-28 15:35:41
阅读次数:
144
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...
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其他好文 时间:
2015-04-28 01:39:20
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120
题目来自:Leetcode
https://leetcode.com/problems/count-primes/
Count Primes
Total Accepted: 831 Total
Submissions: 6167My Submissions
Question
Solution
Description:
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其他好文 时间:
2015-04-27 23:50:05
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174
leetcode -https://leetcode.com/problems/count-primes/Q:Description:Count the number of prime numbers less than a non-negative number,nHint:The number ...
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其他好文 时间:
2015-04-27 18:10:59
阅读次数:
230
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;
...
Sum of Different PrimesTime Limit:5000MSMemory Limit:65536KTotal Submissions:3280Accepted:2040DescriptionA positive integer may be expressed as a sum ...
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其他好文 时间:
2015-04-22 01:46:36
阅读次数:
169