#include<hall.h>
#include<cstdio>
int solve(int n,int k,int s){
	int mn=0,pos=0,tot=0;
	for(int i=1;i<=n;i++){
		if(s&(1<<i-1)) tot++;
		else tot--;
		if(tot<mn) mn=tot,pos=i;
	}
	return s^(1<<pos);
} 

implementer.cpp: In function ‘int main()’:
implementer.cpp:37:14: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   37 |         scanf("%d %d",&n,&K); assert(1<=n&&n<=27&&2*K>n);
      |         ~~~~~^~~~~~~~~~~~~~~
answer.code:1:9: fatal error: hall.h: No such file or directory
    1 | #include<hall.h>
      |         ^~~~~~~~
compilation terminated.