#include "gap.h"
#include<bits/stdc++.h>
using namespace std;
long long findGap(int T, int N)
{
long long l, r, ans = 0;
MinMax(0, 1000000000000000000, &l, &r);
queue<pair<long long, long long>> q;
q.push({l, r});
while (!q.empty())
{
l = q.front().first, r = q.front().second, q.pop();
if (r - l <= ans)
continue;
if (r - l <= 1)
ans = max(ans, r - l);
else if (r - l == 2)
{
long long tl, tr;
MinMax(l, l + 1, &tl, &tr);
ans = max(ans, 2LL - (tr == l + 1));
}
else if (r - l == 3)
{
long long tl, tr;
MinMax(l + 1, r - 1, &tl, &tr);
ans = max(ans, 3LL - (tl == l + 1) - (tr == r - 1));
}
else
{
long long m = (l + r) / 2, ll, lr, rl, rr;
MinMax(l + 1, m, &ll, &lr), MinMax(m + 1, r - 1, &rl, &rr);
if (ll == -1 && rl == -1)
ans = max(ans, r - l);
else if (ll == -1)
ans = max({ans, rl - l, r - rr}), q.push({rl, rr});
else if (rl == -1)
ans = max({ans, ll - l, r - lr}), q.push({ll, lr});
else
ans = max({ans, ll - l, rl - lr, r - rr}), q.push({ll, lr}), q.push({rl, rr});
}
}
return ans;
}
