疑是题目出错

#include<bits/stdc++.h>
#define ll unsigned long long
using namespace std;
const ll N=9e9;
ll n,m,k,a[20][20];
void gl(ll x,ll y){
	if(x==0)return;
	ll z=x/2;
	if(y>z){
		cout<<1;
		gl(z,x-y);
	}
	else{
		cout<<0;
		gl(z,y);
	}
	return;
}
void solve(){
	cin>>n>>m;
	k=(ll)pow(2,n)-1;
	gl(k,m);
	return;
}
int main(){
//	freopen("code.in","r",stdin);
//	freopen("code.out","w",stdout);
	solve();
	return 0;
}