保证 0.5的人数>=1的人数即可

#include<bits/stdc++.h>
using namespace std;
int sum,n,a[21];
void coutt(){
	sum++;
	cout<<"No."<<sum<<": ";
	for(int i=1;i<2*n;i++)cout<<a[i]<<" ";
	cout<<"1"<<endl;
}
void search(int x,int y){
	if(y==n){coutt();return;}
	if(x==n){a[x+y+1]=1;
	search(x,y+1);return;
	} 
	a[x+y+1]=0;
	search(x+1,y);
	if(x>y){a[x+y+1]=1;
	search(x,y+1);
	return;}
	return ;
} 
int main(){
	cin>>n;
	search(0,0);
	return 0;
}