#include "gap.h"
#include<bits/stdc++.h>
using namespace std;
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define F first
#define S second
#define pb push_back
#define pii pair<long long, long long>
#define len(x) (long long)x.size()
template<typename A, typename B>
bool cmax(A &a, const B &b) {
if (a < b) {
a = b;
return true;
}
return false;
}
template<typename A, typename B>
bool cmin(A &a, const B &b) {
if (a > b) {
a = b;
return true;
}
return false;
}
int askcount = 0;
pii ask(long long s, long long t) {
askcount++;
long long mn = 0, mx = 0;
MinMax(s, t, &mn, &mx);
return {mn, mx};
}
long long stupid_solve(int N) {
vector<long long> a(N);
long long itr1 = 0, itr2 = N - 1;
long long l = -1, r = (long long)1e18 + 1;
while (itr1 <= itr2) {
pii res = ask(l, r);
assert(res.F != -1);
assert(res.S != -1);
a[itr1++] = res.F;
a[itr2--] = res.S;
l = res.F + 1;
r = res.S - 1;
}
long long best = -1;
sort(all(a));
for (int i = 0; i < N - 1; i++) {
cmax(best, a[i + 1] - a[i]);
}
return best;
}
long long findGap(int T, int N) {
if (T == 1) return stupid_solve(N);
vector<long long> a;
long long l = -1, r = (long long)1e18 + 1;
MinMax(l, r, &l, &r);
a.pb(l); a.pb(r);
long long dx = (r - l) / (N - 1);
long long MAX = r;
r = l + dx;
while (l < MAX) {
pii res = ask(l, r);
if (res.F != -1) a.pb(res.F);
if (res.S != -1) a.pb(res.S);
l += dx + 1;
r += dx + 1;
}
long long best = -1;
sort(all(a));
// for (auto x: a) cout << x << "\n";
for (int i = 0; i < len(a) - 1; i++) {
cmax(best, a[i + 1] - a[i]);
}
return best;
}
