Language: C++

import java.util.*;
import java.io.*;

class Main {

    public static void main(String[] args) {

	Scanner stdin = new Scanner(System.in);

	while ( stdin.hasNextInt() ) {

	    final int V = stdin.nextInt();
	    final int d = stdin.nextInt();
	    solve( V, d );
	}	
    }

    static void solve( final int V, final int d ) {

	final int[] vs = fibs( V );
	final int[] parents = new int[V];
	final int[] rank = new int[V];
	for ( int i = 0; i < V; i++ ) {
	    parents[i] = i;
	}

	for ( int i = 0; i < V; i++ ) {
	    for ( int j = i + 1; j < V; j++ ) {
		if ( Math.abs( vs[i] - vs[j] ) < d ) {
		    unite( i, j, parents, rank );
		}
	    }
	}
	
	Set<Integer> set = new HashSet<Integer>();
	for ( int i = 0; i < V; i++ ) {
	    final int parent = find( i, parents, rank );
	    if ( !set.contains( parent ) ) {
		set.add( parent );
	    }
	}
	System.out.println( set.size() );	
    }

    static int find( final int x, final int[] parents, final int[] rank ) {
	if ( parents[x] == x ) {
	    return x;
	} else {
	    parents[x] = find( parents[x], parents, rank );
	    return parents[x];
	}
    }
    
    static void unite( int x, int y, final int[] parents, final int[] rank ) {
	final int xp = find( x, parents, rank );
	final int yp = find( y, parents, rank );
	
	if ( xp == yp ) {
	    return;
	}
	
	if ( rank[xp] < rank[yp] ) {
	    parents[xp] = yp;
	} else {
	    parents[yp] = xp;
	    if ( rank[xp] == rank[yp] ) {
		rank[xp]++;
	    }			
	}
    }

    static boolean same( final int x, final int y, final int[] parents, final int[] rank ) {
	return find( x, parents, rank ) == find( y, parents, rank );
    }

    static int[] fibs( final int V ) {

	if ( V == 1 ) {
	    final int[] ar = {2};
	    return ar;
	} else {
	    final int[] vs = new int[V];
	    vs[0] = 2;
	    vs[1] = 3;
	    for ( int i = 2; i < V; i++ ) {
		vs[i] = ( vs[i - 1] + vs[i - 2] ) % 1001;
	    }
	    return vs;
	}
    }
}

Compiler output:
a.cc:1:1: error: 'import' does not name a type
    1 | import java.util.*;
      | ^~~~~~
a.cc:1:1: note: C++20 'import' only available with '-fmodules-ts'
a.cc:2:1: error: 'import' does not name a type
    2 | import java.io.*;
      | ^~~~~~
a.cc:2:1: note: C++20 'import' only available with '-fmodules-ts'
a.cc:6:11: error: expected ':' before 'static'
    6 |     public static void main(String[] args) {
      |           ^~~~~~~
      |           :
a.cc:6:29: error: 'String' has not been declared
    6 |     public static void main(String[] args) {
      |                             ^~~~~~
a.cc:6:38: error: expected ',' or '...' before 'args'
    6 |     public static void main(String[] args) {
      |                                      ^~~~
a.cc:18:24: error: 'final' has not been declared
   18 |     static void solve( final int V, final int d ) {
      |                        ^~~~~
a.cc:18:24: error: two or more data types in declaration of 'V'
a.cc:18:35: error: expected ')' before ',' token
   18 |     static void solve( final int V, final int d ) {
      |                      ~            ^
      |                                   )
a.cc:18:37: error: variable or field 'final' declared void
   18 |     static void solve( final int V, final int d ) {
      |                                     ^~~~~
a.cc:18:37: error: expected ';' at end of member declaration
   18 |     static void solve( final int V, final int d ) {
      |                                     ^~~~~
      |                                          ;
a.cc:18:47: error: expected ';' at end of member declaration
   18 |     static void solve( final int V, final int d ) {
      |                                               ^
      |                                                ;
a.cc:18:49: error: expected unqualified-id before ')' token
   18 |     static void solve( final int V, final int d ) {
      |                                                 ^
a.cc:45:22: error: 'final' has not been declared
   45 |     static int find( final int x, final int[] parents, final int[] rank ) {
      |                      ^~~~~
a.cc:45:22: error: two or more data types in declaration of 'x'
a.cc:45:33: error: expected ')' before ',' token
   45 |     static int find( final int x, final int[] parents, final int[] rank ) {
      |                    ~            ^
      |                                 )
a.cc:45:35: error: expected ';' at end of member declaration
   45 |     static int find( final int x, final int[] parents, final int[] rank ) {
      |                                   ^~~~~
      |                                        ;
a.cc:45:44: error: expected unqualified-id before '[' token
   45 |     static int find( final int x, final int[] parents, final int[] rank ) {
      |                                            ^
a.cc:54:38: error: 'final' is not a type
   54 |     static void unite( int x, int y, final int[] parents, final int[] rank ) {
      |                                      ^~~~~
a.cc:54:38: error: two or more data types in declaration of 'parameter'
a.cc:54:49: error: expected ')' before 'parents'
   54 |     static void unite( int x, int y, final int[] parents, final int[] rank ) {
      |                      ~                          ^~~~~~~~
      |                                                 )
a.cc:54:48: error: expected ';' at end of member declaration
   54 |     static void unite( int x, int y, final int[] parents, final int[] rank ) {
      |                                                ^
      |                                                 ;
a.cc:54:50: error: 'parents' does not name a type
   54 |     static void unite( int x, int y, final int[] parents, final int[] rank ) {
      |                                                  ^~~~~~~
a.cc:72:12: error: 'boolean' does not name a type; did you mean 'bool'?
   72 |     static boolean same( final int x, final int y, final int[] parents, final int[] rank ) {
      |            ^~~~~~~
      |            bool
a.cc:76:15: error: expected unqualified-id before '[' token
   76 |     static int[] fibs( final int V ) {
      |               ^
a.cc:91:2: error: expected ';' after class definition
   91 | }
      |  ^
      |  ;
a.cc: In static member function 'static void Main::main(int*)':
a.cc:8:9: error: 'Scanner' was not declared in this scope
    8 |         Scanner stdin = new Scanner(System.in);
      |         ^~~~~~~
a.cc:10:17: error: 'stdin' was not declared in this scope
   10 |         while ( stdin.hasNextInt() ) {
      |                 ^~~~~
a.cc:1:1: note: 'stdin' is defined in header '<cstdio>'; this is probably fixable by adding '#include <cstdio>'
  +++ |+#include <cstdio>
    1 | import java.util.*;
a.cc:12:19: error: expected ';' before 'int'
   12 |             final int V = stdin.nextInt();
      |                   ^~~
a.cc:13:19: error: expected ';' before 'int'
   13 |             final int d = stdin.nextInt();
      |                   ^~~
a.cc:14:20: error: 'V' was not declared in this scope
   14 |             solve( V, d );
      |                    ^
a.cc:14:23: error: invalid use of member 'Main::d' in static member function
   14 |             solve( V, d );
      |                       ^
a.cc:18:47: note: declared here
   18 |     static void solve( final int V, final int d ) {
      |                                               ^