普及－求大佬帮通过

#include<iostream>

using namespace std;
inline int read(){
   unsigned long long  int x=0;
    char ch=getchar();
    while(ch<'0'||ch>'9')  ch=getchar();
    
    while(ch>='0'&&ch<='9'){
        x=(x<<1)+(x<<3)+(ch^48);
        ch=getchar();
    }
    return x;
}
int main(){
	int n;
	char a[70]={0};
	unsigned long long int i=0,j=1,k;
	int p=0,flag=0;
	n=read(); k=read();
	//cin>>n>>k;
	for (int i=1;i<=n;i++) j=j*2;
	j=j-1;

	while(i<j){

		unsigned long long int m=(i+j)>>1;
		if (m>=k) {
			a[p++]=flag+48;
			j=m;
			flag=0;
		} else {
			a[p++]=(1^flag)+48;
			flag=1;
			i=m+1;
		}
	//	cout<<m<<endl;
	}
	
	for (int i=0;i<p;i++)
	cout<<a[i];
	return 0;
}