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#include <iostream>
using namespace std;
 
int main() {
	// your code goes here
	return 0;#include <bits/stdc++.h>
 
using namespace std;
 
void FAST_IO() {
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
}
 
#define REP(_i, _a) for(int _i = 0; _i < _a; ++_i)
#define FOR(_i, _a, _b) for(int _i = _a; _i <= _b; ++_i)
#define FORD(_i, _a, _b) for(int _i = _a; _i >= _b; --_i)
#define RESET(_a, _value) fill_n(_a,sizeof(_a)/sizeof(_a[0]),_v)
#define ALL(_a) _a.begin(), _a.end()
#define SIZE(_a) _a.size()
#define pb push_back
#define eb emplace_back
#define mp make_pair
#define fi first
#define se second
#define newline '\n';
 
// DEBUG UTIL
#define DEBUG(args...) { cerr << "> "; \
						 string _s = #args; \
						 replace(_s.begin(), _s.end(), ',', ' '); \
						 stringstream _ss(_s); istream_iterator<string> _it(_ss); \
						 err(_it, args); }
 
void err(istream_iterator<string> it) { cerr << endl; }
template<typename T, typename... Args>
void err(istream_iterator<string> it, T a, Args... args) {
	cerr << *it << ": " << a << " ";
	err(++it, args...);
}
 
typedef long long ll;
typedef pair<int, int> ii;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<double, double> pdd;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ii> vii;
 
const double PI = acos(-1.0);
const int MOD = 1e9 + 7;
const int INF = 2e9;
 
const int MAX_N = 1e3 + 5;
 
int N, U;
vi arr;
 
int main() {
	FAST_IO();
 
	cin >> N >> U;
	REP(i, N) {
		int a;
		cin >> a;
		arr.pb(a);
	}
 
	auto it_k = arr.begin();
 
	double ans = -1.0;
 
	while (it_k != arr.end()) {
 
		auto it_i = lower_bound(arr.begin(), it_k, *it_k - U);
 
		if (it_i != it_k && *it_i >= *it_k - U) {
			int i = *it_i;
			++it_i;
			if (it_i != it_k) {	
				int j = *it_i;
				int k = *it_k;
 
				ans = max(ans, ((double)(k-j))/(double)(k-i));
			}
		}
		++it_k;
	}
 
	cout << fixed << setprecision(10) << ans << endl;
 
	return 0;
}
}

prog.cpp:6:11: error: stray ‘#’ in program
  return 0;#include <bits/stdc++.h>
           ^
prog.cpp: In function ‘int main()’:
prog.cpp:6:12: error: ‘include’ was not declared in this scope
  return 0;#include <bits/stdc++.h>
            ^~~~~~~
prog.cpp:6:21: error: ‘bits’ was not declared in this scope
  return 0;#include <bits/stdc++.h>
                     ^~~~
prog.cpp:6:26: error: ‘stdc’ was not declared in this scope
  return 0;#include <bits/stdc++.h>
                          ^~~~
prog.cpp:8:1: error: expected primary-expression before ‘using’
 using namespace std;
 ^~~~~
prog.cpp:10:16: error: a function-definition is not allowed here before ‘{’ token
 void FAST_IO() {
                ^
prog.cpp:36:10: error: variable or field ‘err’ declared void
 void err(istream_iterator<string> it) { cerr << endl; }
          ^~~~~~~~~~~~~~~~
prog.cpp:36:10: error: ‘istream_iterator’ was not declared in this scope
prog.cpp:36:33: error: expected primary-expression before ‘>’ token
 void err(istream_iterator<string> it) { cerr << endl; }
                                 ^
prog.cpp:36:35: error: ‘it’ was not declared in this scope
 void err(istream_iterator<string> it) { cerr << endl; }
                                   ^~
prog.cpp:37:1: error: a template declaration cannot appear at block scope
 template<typename T, typename... Args>
 ^~~~~~~~
prog.cpp:46:14: error: ‘ll’ was not declared in this scope
 typedef pair<ll, ll> pll;
              ^~
prog.cpp:46:18: error: the value of ‘ll’ is not usable in a constant expression
 typedef pair<ll, ll> pll;
                  ^~
prog.cpp:46:14: note: ‘ll’ was not declared ‘constexpr’
 typedef pair<ll, ll> pll;
              ^~
prog.cpp:46:20: error: template argument 1 is invalid
 typedef pair<ll, ll> pll;
                    ^
prog.cpp:46:20: error: type/value mismatch at argument 2 in template parameter list for ‘template<class _T1, class _T2> struct std::pair’
prog.cpp:46:20: note:   expected a type, got ‘ll’
prog.cpp:48:9: error: ‘vector’ does not name a type
 typedef vector<int> vi;
         ^~~~~~
prog.cpp:49:9: error: ‘vector’ does not name a type
 typedef vector<vi> vvi;
         ^~~~~~
prog.cpp:50:9: error: ‘vector’ does not name a type
 typedef vector<ii> vii;
         ^~~~~~
prog.cpp:52:28: error: ‘acos’ was not declared in this scope
 const double PI = acos(-1.0);
                            ^
prog.cpp:59:1: error: ‘vi’ was not declared in this scope
 vi arr;
 ^~
prog.cpp:61:12: error: a function-definition is not allowed here before ‘{’ token
 int main() {
            ^
prog.cpp:96:1: error: expected ‘}’ at end of input
 }
 ^

Standard output is empty