//欧拉函数
#include <iostream>
#include <algorithm>
using namespace std;
int main()
{
int n;
cin >> n;
while(n--)
{
int a;
cin >> a;
int res = a;
for(int i = 2 ; i <=a / i ; i++)
{
if(a % i == 0)
{
res = res / i*(i - 1);
while(a % i == 0) a /= i;
}
}
if(a > 1) res = res / a*(a - 1);
cout << res << endl;
}
return 0;
}
Euler function template _
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Origin blog.csdn.net/qq_45244489/article/details/105074494
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