#include <bits/stdc++.h>
#include "gap.h"
using namespace std;
#define ll long long
#define sz(s) (int)s.size()
ll findGap(int T, int n){
vector <ll> v, v1;
ll k = 0;
ll ans = 0;
for(int i = 1; i <= (n+1)/2; i++){
ll s, t, mn, mx;
if(i == 1) s = 0, t = 1e18;
else s = v.back()+1, t = v1.back()-1;
if(s > t) break;
MinMax(s, t, &mn, &mx);
if(mn != -1) v.push_back(mn);
if(mx != -1) v1.push_back(mx);
k += (t-s+1);
if(sz(v) > 1) ans = max(ans, (v.back()-v[sz(v)-2]));
if(sz(v1) > 1) ans = max(ans, (v1[sz(v1)-2]-v1.back()));
if(i == (n+1)/2) ans = max(ans, v1.back()-v.back());
}
return ans;
}
