public static int indexOfFirstOne ( int arr [ ] , int low , int high ) {
  while ( low <= high ) {
    int mid = ( low + high ) / 2 ;
    if ( arr [ mid ] == 1 && ( mid == 0 || arr [ mid - 1 ] == 0 ) ) return mid ;
    else if ( arr [ mid ] == 1 ) high = mid - 1 ;
    else low = mid + 1 ;
  }
  return - 1 ;
}

public static int indexOfFirstOne ( int arr [ ] , int low , int high ) { while ( low <= high ) { int mid = ( low + high ) / 2 ; if ( arr [ mid ] == 1 && ( mid == 0 || arr [ mid - 1 ] == 0 ) ) return mid ; else if ( arr [ mid ] == 1 ) high = mid - 1 ; else low = mid + 1 ; } return - 1 ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier) dimensions: (dimensions)) (formal_parameter type: (integral_type) name: (identifier)) (formal_parameter type: (integral_type) name: (identifier))) body: (block (while_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) right: (decimal_integer_literal)))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (decimal_integer_literal)) right: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (binary_expression left: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal))) right: (decimal_integer_literal)))))) consequence: (return_statement (identifier)) alternative: (if_statement condition: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (decimal_integer_literal))) consequence: (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))) alternative: (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))))))) (return_statement (unary_expression operand: (decimal_integer_literal)))))