#include "gap.h"
#define ll long long
#include<bits/stdc++.h>
using namespace std;
long long findGap(int T, int N)
{
ll s, t;
MinMax(0, 1e18, &s, &t);
ll L = t - s;
ll d = (L+N-2) / (N - 1);
ll ans = d;
d++;
ll x = s;
while(x != t){
ll p, q;
if(x + d >= t) break;
MinMax(x + 1, x + d, &p , &q);
if(q != -1) {
ans = max(ans, x - p);
x = q;
continue;
}
int w = 2;
while(1){
MinMax(x + 1,min( x + w * d, (ll)1e18),&p , &q);
if(q == -1) {w++; continue;}
ans = max(ans, p - x);
d = ans;
x = q;
break;
}
}
return ans;
}
