HDOJ 2138-How many prime numbers

How many prime numbers

Time Limit: 3000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)

Total Submission(s): 14844    Accepted Submission(s): 5140

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 

#include<stdio.h>#include<string.h>#include<cmath>#include<algorithm>using namespace std;bool F(int cmp){for(int i=2;i<=sqrt(cmp);i++){if(cmp%i==0)return false;}return true;}int main(){int nn;while(scanf("%d",&nn)!=EOF){int i,j=0;for(i=0;i<nn;i++){int yy;scanf("%d",&yy);if(F(yy))j++;}printf("%d\n",j);}return 0;}