;; The first three lines of this file were inserted by DrRacket. They record
metadata
;; about the language level of this file in a form that our tools can easily
process.
#reader(lib "htdp-intermediate-reader.ss" "lang")((modname pset-07-solution) (read-
case-sensitive #t) (teachpacks ()) (htdp-settings #(#t constructor repeating-
decimal #f #t none #f () #t)))
;; DO NOT PUT ANYTHING PERSONALLY IDENTIFYING BEYOND YOUR CWL IN THIS FILE.
;; YOUR CWLs WILL BE SUFFICIENT TO IDENTIFY YOU AND, IF YOU HAVE ONE, YOUR
;; PARTNER.
;;
(require spd/tags)
(@assignment psets/pset-07); Do not edit or remove this tag
(@problem 1)
(@htdd 1String)
;; 1String is String
;; interp. a 1String represents a single letter
;; CONSTRAINT: any 1String is only one letter long
(@htdd ListOf1String)
;; ListOf1String is one of:
;; - empty
;; - (cons 1String ListOf1String)
;; interp. a sequence of letters
(define L1 empty)
(define L2 (list "a" "B" "c"))
(@htdd Operations)
;; Operations is one of:
;; - empty
;; - (cons "keep" Operations)
;; - (cons "space" Operations)
;; - (cons "remove" Operations)
;; interp. a sequence of operations to apply to a list of 1String
;; "keep" means keep the corresponding letter
;; "space" means replace the corresponding letter with a " "
;; "remove" means remove the corresponding letter
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