这是我的代码QAQ

#include<bits/stdc++.h>
using namespace std;
int a,b,p,x=1;
	cin>>a>>b>>p;
	for(int i=1;i<=b;i++){
		if(b!=0){
			x*=a;
			x=x%p;
		}else{
			x=1;
			x=x%p;
		}
		
	}
int main(){
	cin>>a>>b>>k;
	cout<<a<<" ^ "<<b<<" mod "<<p<<" = "<<x;
} 

这是dalao的代码

#include<bits/stdc++.h>
#define LL long long
using namespace std;
LL n,m,k;
LL ksm(LL x,LL y)
{
	LL a=1,b=x;
	while(y>0)
	{
		if(y%2==1)
		{
			a=a*b;
			a=a%m;
		}
		b=b*b;
		b=b%m;
		y=y/2;
	}
	return a;
}
int main()
{
	cin>>n>>k>>m;
	cout<<n<<"^"<<k<<" mod "<<m<<"="<<ksm(n,k)%m<<endl;; 
	return 0;
}

why...QAQ