#include "bits/stdc++.h"
#include "gap.h"
using namespace std;
using ll = long long;
long long findGap(int T, int N)
{
ll cep,sag;
MinMax(1,(ll)1e18,&cep,&sag);
assert(cep != -1 && sag != -1);
ll now = cep,ans = 1;
while(now < sag){
ll nwa,nwb;
MinMax(now + 1,now + ans + 1,&nwa,&nwb);
if(nwa != -1){
ans = max(ans,nwa - now);
now = nwb;
continue;
}
ans++;
while(1){
MinMax(now + 1,now + ans * 2,&nwa,&nwb);
if(nwa != -1){
ans = max(nwa - now,ans);
now = nwb;
break;
}
ans *= 2;
ans++;
}
}
return ans;
}
