BCSP2024JR1

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#include<iostream>
using namespace std;
int x,y,n,m;
int a[1000];
string num="0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
void change(int i,int j){
	a[i]^=a[j];
	a[j]^=a[i];
	a[i]^=a[j];
}
int main (){
	cin >> x >> y;
	m=(1<<y)-1;
	while(x!=0){
	    n++;
	    a[n]=(x&m);
	    x=(x>>y);
	}
	for(int i=1;i<=n/2;i++){
	    change(i,n-i+1);
	}
	for(int i=1;i<=n;i++){
	    cout << num[a[i]];
	}
return 0; 
}