#include <bits/stdc++.h>
using namespace std;
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#define fi first
#define se second
#define ll long long
#define pb push_back
#define ii pair<int,int>
const int nax=2e3+5;
void MinMax(long long, long long, long long*, long long*);
long long findGap(int T, int N)
{
long long lst,mx;
MinMax(0,1e18,&lst,&mx);
long long ans=1;
while(mx>lst){
long long a,b;
MinMax(lst+1,lst+ans,&a,&b);
if(a==-1){
while(a==-1){
ans*=2;
MinMax(lst+1,lst+ans,&a,&b);
}
long long cur=lst+ans;
ans=a-lst;
lst=cur-1;
}else{
lst=b;
}
}
return ans;
}
