This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include "gap.h"
#include<iostream>
#include<set>
#include<algorithm>
using namespace std;
typedef long long int llint;
set <llint> s;
llint fnd(llint x,llint r) {
	set <llint>::iterator it=s.lower_bound(x+1);
	if(it!=s.end() && (*it)<=x+r) return (*it);
	llint mn=0,mx=0;
	MinMax(x+1,x+r,&mn,&mx);
	s.insert(mn);
	s.insert(mx);
	return mx;
}
llint findGap(int T, int N)
{
	llint mn,mx;
	/*cout << 1 << " " << 1e18 << "\n";
	cin >> mn >> mx;*/
	MinMax(1LL,(llint)1e18,&mn,&mx);
	llint x=mn,y=mx,rr=mx-mn,r=(mx-mn)/(N-1)+((mx-mn)%(N-1)!=0);
	s.insert(mn);
	s.insert(mx);
	while(x!=y) {
		llint x1=fnd(x,r);
		if(x1!=-1) {
			x=x1;
			continue;
		}
		llint lo=r,hi=min(y-x,r*2);
		while(lo<hi) {
			llint mid=(lo+hi)/2;
			/*cout << x << " " << x+mid << "\n";
			cin >> mn >> mx;*/
			if(fnd(x,mid)!=-1) hi=mid;
			else lo=mid+1;
		}
		if(lo<r*2) x+=lo;
		r=lo;
	}
	return r;
}
/*int main()
{
	cout << findGap(1,5);
	return 0;
}*/
Compilation message (stderr)
gap.cpp: In function 'llint findGap(int, int)':
gap.cpp:23:18: warning: unused variable 'rr' [-Wunused-variable]
   23 |  llint x=mn,y=mx,rr=mx-mn,r=(mx-mn)/(N-1)+((mx-mn)%(N-1)!=0);
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