这都要看题解？

#include<bits/stdc++.h>
using namespace std;
#define int long long
const int e=1e9;
int pow_pro(int a,int b){
	int k=1;
	for(int i=1;i<=b;i++){
		k*=a;
		if(k>e){
			return -1;
		}
	}
	return k;
}
signed main(){
	int a,b;
	cin>>a>>b;
	cout<<pow_pro(a,b);
	return 0;
}