static void compressString ( String s , int n ) {
  int freq [ ] = new int [ MAX ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    freq [ s . charAt ( i ) - 'a' ] ++ ;
  }
  for ( int i = 0 ;
  i < MAX ;
  i ++ ) {
    if ( freq [ i ] == 0 ) continue ;
    System . out . print ( ( char ) ( i + 'a' ) + "" + freq [ i ] ) ;
  }
}

static void compressString ( String s , int n ) { int freq [ ] = new int [ MAX ] ; for ( int i = 0 ; i < n ; i ++ ) { freq [ s . charAt ( i ) - ' a ' ] ++ ; } for ( int i = 0 ; i < MAX ; i ++ ) { if ( freq [ i ] == 0 ) continue ; System . out . print ( ( char ) ( i + ' a ' ) + " " + freq [ i ] ) ; } }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (type_identifier) name: (identifier)) (formal_parameter type: (integral_type) name: (identifier))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) dimensions: (dimensions) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (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: (block (expression_statement (update_expression (array_access array: (identifier) index: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (character_literal))))))) (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: (block (if_statement condition: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (decimal_integer_literal))) consequence: (continue_statement)) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (binary_expression left: (cast_expression type: (integral_type) value: (parenthesized_expression (binary_expression left: (identifier) right: (character_literal)))) right: (string_literal)) right: (array_access array: (identifier) index: (identifier))))))))))