给大家看一眼我那 $\color{black}\small丑陋的代码:$

#include<bits/stdc++.h>
#define ll long long
using namespace std;
ll mi(ll a,ll n,ll p){
    ll TLE=1;
    while(n!=0){
        if(n&1)TLE*=a;
        a*=a; 
        n>>=1;
    }
    return TLE%p;
}
int main(){
	ll a,n,p;
	cin>>a>>n>>p;
	cout<<a<<'~'<<n<<" "<<"mod"<<" "<<p<<'='<<mi(a,n,p)<<endl;
	return 0;
}

ε=(´ο｀*)))唉，全Wrong Answer！

大佬们教教我吧