#include "gap.h"
#include <bits/stdc++.h>
#define ll long long
#define F first
#define S second
#define all(x) x.begin(), x.end()
#define pb push_back
#define FIO ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)
using namespace std;
long long findGap(int T, int N)
{
ll inf = 1e18;
set <ll> s;
ll a, b, nn = 2, mx = 0, la = -1;
MinMax(0, inf, &a, &b);
s.insert(a);
s.insert(b);
while (nn < N) {
ll c = a+1, d = b-1;
MinMax(c, d, &a, &b);
s.insert(a);
s.insert(b);
nn += 2;
}
for (auto it : s) {
if (la != -1) {
mx = max(mx, it - la);
}
la = it;
}
return mx;
}
