Communication/Interactive checker for CMS

manager.cpp

#include <bits/stdc++.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <signal.h>
using namespace std;
void handler(int signum){
	cout<<0;
	cerr<<"Idleness limit Exceeded!";
	exit(0);
}
int main(int argc, char* argv[]){
	signal(SIGALRM,handler);
	alarm(1);
	auto fi = fdopen(open(argv[1],O_RDWR),"r");
	auto fo = fdopen(open(argv[2],O_RDWR),"w");
	setvbuf(fi, 0LL, 2, 0LL);
	setvbuf(fo, 0LL, 2, 0LL);
	int h,n;
	cin>>h>>n;
	fprintf(fo,"%d\n",h);
	int cnt=log2(h)+2;
	while(cnt--){
		int q;
		fscanf(fi,"%d",&q);
		if(q<=0){
			cout<<0;
			cerr<<"Invalid query!";
			exit(0);
		}
		if(q>n) {
			fprintf(fo,"H\n");
		}
		else if(q<n){
			fprintf(fo,"L\n");
		}
		else{
			cout<<1;
			cerr<<"okok! Correct number.";
			exit(0);
		}
	}
	cout<<0;
	cerr<<"You guessed too much!";
	exit(0);
}