How many prime numbers

 Time Limit: 3000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 10878 Accepted Submission(s): 3566 

Problem Description

Give you a lot of positive integers, just to find out how many prime numbers there are.

 

Input

There are a lot of cases. In each case, there is an integer N representing the number of integers to find. Each integer won’t exceed 32-bit signed integer, and each of them won’t be less than 2.

 

Output

            For each case, print the number of prime numbers you have found out.

 

Sample Input

32 3 4

 

Sample Output

2

 

Author

wangye

 

Source

HDU 2007-11 Programming Contest_WarmUp
打表会超时，够坑

#include<iostream>      #include<math.h>      using namespace std;      #define N 100000000      int main()      {          int n,b,s,f,i;          while(scanf("%d",&n)!=EOF)          {              s=0;              while(n--)              {                  scanf("%d",&b);                  f=0;                  for(i=2;i<=sqrt(b*1.0);i++)                      if(b%i==0)                      {f=1;break;}                      if(!f)s++;              }              printf("%d\n",s);          }          return 0;      }