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test...

let’s start it.

$ Orz $

$ \tt{O(1)} $

$ \text{令 }\lambda_{n}{(P)}=\frac{\max \limits_{1 \leq i < j \leq n} \{|p_i p_j|\}} {\min\limits_{1 \leq i < j \leq n}\{|p_i p_j| \}} $

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#include <bits/stdc++.h>

#define test(...) fprintf(stderr, __VA_ARGS__)
#define dbg(x) cerr << #x << " = " << x << '\n'

using namespace std;

typedef long long ll;
typedef pair <int, int> pii;
typedef vector <int> vi;
typedef unsigned int ui;
typedef vector <pair <int, int> > edges;

void solve() {

}

int main() {
#ifdef LOCAL
freopen("sample.in", "r", stdin);
#endif
int tests = 1;
while (tests--) solve();
return 0;
}