static boolean isPairWithDiff ( int mat [ ] [ ] , int k ) {
  HashSet < Integer > s = new HashSet < Integer > ( ) ;
  for ( int i = 0 ;
  i < N ;
  i ++ ) for ( int j = 0 ;
  j < M ;
  j ++ ) s . add ( mat [ i ] [ j ] ) ;
  for ( int i = 0 ;
  i < N ;
  i ++ ) for ( int j = 0 ;
  j < M ;
  j ++ ) if ( s . contains ( k + mat [ i ] [ j ] ) && k + mat [ i ] [ j ] != ( int ) s . toArray ( ) [ s . size ( ) - 1 ] ) return true ;
  return false ;
}

static boolean isPairWithDiff ( int mat [ ] [ ] , int k ) { HashSet < Integer > s = new HashSet < Integer > ( ) ; for ( int i = 0 ; i < N ; i ++ ) for ( int j = 0 ; j < M ; j ++ ) s . add ( mat [ i ] [ j ] ) ; for ( int i = 0 ; i < N ; i ++ ) for ( int j = 0 ; j < M ; j ++ ) if ( s . contains ( k + mat [ i ] [ j ] ) && k + mat [ i ] [ j ] != ( int ) s . toArray ( ) [ s . size ( ) - 1 ] ) return true ; return false ; }
(method_declaration (modifiers) type: (boolean_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier) dimensions: (dimensions)) (formal_parameter type: (integral_type) name: (identifier))) body: (block (local_variable_declaration type: (generic_type (type_identifier) (type_arguments (type_identifier))) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (generic_type (type_identifier) (type_arguments (type_identifier))) arguments: (argument_list)))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (array_access array: (identifier) index: (identifier)) index: (identifier))))))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (if_statement condition: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (array_access array: (array_access array: (identifier) index: (identifier)) index: (identifier))))) right: (binary_expression left: (binary_expression left: (identifier) right: (array_access array: (array_access array: (identifier) index: (identifier)) index: (identifier))) right: (cast_expression type: (integral_type) value: (array_access array: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) index: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (decimal_integer_literal))))))) consequence: (return_statement (true))))) (return_statement (false))))