#include "gap.h"
#include<bits/stdc++.h>
//#define int long long
#define pii pair<int,int>
#define fi first
#define se second
/*#pragma GCC target ("avx2")
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")
#pragma GCC optimize("Ofast")
#pragma GCC target("avx,avx2,fma")*/
using namespace std;
using ll = long long;
using ull = unsigned long long;
using ldb = long double;
const int N = (int)5e5;
const int maxN = (int)5e5 + 5;
const int mod = 1e9 + 7;
//const int mod = 998244353;
const ll infty = 1e18;
const ll logn = 18;
const int base = 311;
const int Block_size = 500;
const int ep = 'a';
int cu[] = {0,0,1,-1};
int cv[] = {-1,1,0,0};
int du[] = {-1,-1,+1,1};
int dv[] = {-1,+1,-1,1};
int cled[] = {6,2,5,5,4,5,6,3,7,6};
void InputFile()
{
freopen(".inp","r",stdin);
freopen(".out","w",stdout);
//freopen("test.out","r",stdin);
}
void FastInput()
{
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
}
/*void MinMax(int L,int R,int x,int y)
{
return;
}*/
ll a[maxN];
ll findGap(int T, int n)
{
if(T == 1)
{
ll l = 0, r = 1e18, a[n + 1];
for (int i = 1; i <= n && (n - i + 1) >= i; i++)
{
MinMax(l, r, &a[i], &a[n - i + 1]);
l = a[i] + 1;
r = a[n - i + 1] - 1;
}
ll ans = 0;
for (int i = 2; i <= n; i++)
{
ans = max(ans, a[i] - a[i - 1]);
}
return ans;
}
ll res = 0;
ll mini,maxi;
MinMax(0,infty, &mini, &maxi);
ll pre = mini;
ll h = (maxi - mini + n - 2) / (n - 1);
ll now = mini + 1;
while(true)
{
ll p, q;
MinMax(now, now + h - 1, &p, &q);
res = max(res, p - pre);
pre = max(pre, q);
now += h;
if(q == maxi) break;
}
return res;
}
/*void Read()
{
}
void Solve()
{
}
void Debug()
{
//Main_sub();
//Naive();
}
signed main()
{
FastInput();
//InputFile();
//int sub_type;
//cin >> sub_type;
//Sieve();
int test;
//cin >> test;
test = 1;
while(test--)
//for(int prc = 1; prc <= test; prc++)
{
Read();
Solve();
//Debug();
}
}*/
