版权声明:本文为博主原创文章,未经博主允许不得转载。 https://blog.csdn.net/lzc842650834/article/details/86652407
1007 素数对猜想
题目复制有乱码,就不再累述了,很基础的一道题。
#include<iostream>
#include<math.h>
using namespace std;
//判断是否是素数
int judge(int num)
{
int temp = sqrt(num);
if (num == 2) {
return 1;
} else {
for (int i = 2; i <= temp; i++) {
if (num % i == 0) {
return 0;
}
}
}
return 1;
}
int main()
{
int N;
int count = 0;
cin >> N;
for (int i = 3; i <= N - 2; i += 2) {
if (judge(i)) {
if (judge(i + 2)) {
count++;
}
}
}
cout << count << endl;
return 0;
}