hdu 2138

How many prime numbers

Time Limit: 3000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 7656    Accepted Submission(s): 2563

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

 

Recommend

威士忌

 

#include <stdio.h>#include <math.h>int isPrime(int n){int i, l = sqrt(n);for(i = 2; i <= l; i++)if(n % i == 0)return 0;return 1;}int main(){int n, num, acount;while(~scanf("%d", &n)){acount = 0;while(n--){scanf("%d", &num);if(isPrime(num))acount++;}printf("%d\n", acount);}return 0;}