func_code_string: #include <bits/stdc++.h>   using namespace std;   const int MAXN = 100010;   int n, U, a[MAXN];   double ans = 0;   int main() {     cin >> n >> U;     for (int i = 1; i <= n; i++) cin >> a[i];     int now = 1;     for (int i = 1; i <= n; i++) {       while (now <= n && a[now] - a[i] <= U) now++;       now--;       if (now - i + 1 < 3) continue;       ans = max(ans, (a[now] - a[i + 1]) * 1.0 / (a[now] - a[i]));     }     if (ans == 0)       cout << -1 << endl;     else       printf( %.10lf n , ans);     return 0;   }   