#include<bits/stdc++.h>
#include "gap.h"
using namespace std;
const long long MAXN = 2e5 + 10;
long long a[MAXN];
long long findGap(int T, int N)
{
if(T == 1)
{
long long s = 0, t = (long long)(1e18);
long long mn, mx;
long long n = N;
long long filled0 = 0, filled1 = n+1;
while(filled0 + 1 <= filled1 - 1)
{
MinMax(s, t, &mn, &mx);
if(mn == mx)
{
filled0 ++;
a[filled0] = mn;
n --;
break;
}
filled0 ++;
filled1 --;
n-= 2;
a[filled0] = mn;
a[filled1] = mx;
s = mn + 1;
t = mx - 1;
}
long long ans = -1;
//cout << "n is " << n << endl;
//cout << a[1] << " ";
for (long long i = 2; i <= N; ++ i)
{
//cout << a[i] << " ";
ans = max(ans, (long long) (a[i] - a[i-1]));
}
//cout << endl;
//cout << ans << endl;
return ans;
}
long long s = 0, t = (long long)(1e18), mn, mx;
MinMax(s, t, &mn, &mx);
long long curr = mn, last = mx;
long long ans = 1;
priority_queue < long long > q;
while(curr < last)
{
// cout << curr << endl;
// cout << "* " << ans << endl;
s = curr + 1;
t = curr + ans;
if(s <= t)
{
MinMax(s, t, &mn, &mx);
if(mn != -1 && mx != -1)
{
curr = mx;
//cout << "move to " << curr << endl;
continue;
}
}
while(!q.empty() && -q.top() <= curr)
{
q.pop();
}
long long limit = last;
if(!q.empty())limit = -q.top();
long long lf = ans, rth = min(limit - curr, last - curr), mid, newans = -1;
s = curr + 1;
t = curr + rth + 1;
MinMax(s, t, &mn, &mx);
if(mn == -1 && mx == -1)
{
lf = rth;
}
long long found = 0;
while(lf <= rth)
{
mid = (rth - lf)/2 + lf;
s = curr + 1;
t = curr + mid + 1;
MinMax(s, t, &mn, &mx);
if(mn == -1 && mx == -1)
{
lf = mid + 1;
}
else
{
rth = mid - 1;
q.push(-mx);
found = mx;
newans = mid;
}
}
// cout << "found is " << found << endl;
if(newans != -1)ans = found - curr;
else break;
curr = found;
}
return ans;
}
