[Problem solution] Luogu P1965 spinning game

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topic

Logo P1965 spinning game

Code

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
ll n,m,k,x;
inline ll quick_pow(ll a,ll b)
{
	ll ans=1;
	for( ;b;b>>=1)
	{
		if(b&1) ans=ans*a%n;
		a=a*a%n;
	}
	return ans;
}

int main()
{
	scanf("%lld%lld%lld%lld",&n,&m,&k,&x);
	ll ans=(x+m*quick_pow(10,k)%n)%n;
	printf("%lld\n",ans);
	
	return 0;
}