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358 lines
10 KiB
358 lines
10 KiB
#!/usr/bin/guile -s
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!#
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;=============== functions with side effects (I/O) ======================
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(use-modules (ice-9 rdelim))
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(define (read-lines)
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((lambda (line)
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(if (eof-object? line) '() (cons line (read-lines))))
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(read-line)))
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(define (display-ln value) (list (display value) (display "\n")))
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(define (assert-eq error-message expected actual)
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(if (not (equal? expected actual))
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(display-ln (list error-message (list "expected" expected) (list "actual" actual)))
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'()))
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(define (tee value) (car (list value (display-ln value))))
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(define (tee-with-comment comment) (lambda (value) (car (list value (display comment) (display " ") (display-ln value)))))
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;=============== end of functions with side effects ======================
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(define (id value) value)
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(define (is value) (lambda (x) (equal? x value)))
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(define (is-not value) (lambda (x) (not (equal? x value))))
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(define (is-not-empty value) (not (null? value)))
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;=============== prepend ======================
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(define (prepend first-value) (lambda (rest) (cons first-value rest)))
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(assert-eq "prepend test failed"
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'(1 2 3 4)
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((prepend 1) '(2 3 4)))
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;=============== combinators ======================
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(define (Y f) (f (lambda (x) ((Y f) x))))
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(define (Y2 f) (f (lambda (x y) ((Y2 f) x y))))
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(assert-eq "Y test 1 (factorial) failed"
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120
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((Y (lambda (f) (lambda (n) (if (= n 0) 1 (* n (f (- n 1))))))) 5))
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(assert-eq "Y2 test 1 (pascal triangle) failed"
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35
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((Y2 (lambda (f) (lambda (a b)
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(if (= a 0) 1 (if (= b 0) 1 (+ (f (- a 1) b) (f a (- b 1))))))))
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3 4))
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;=============== reduce-right ======================
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(define (reduce-right initial reducer) (Y
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(lambda (f) (lambda (values)
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(if (null? values) initial (reducer (car values) (f (cdr values))))))))
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(assert-eq "reduce-right test 1 failed"
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'(4 101 3 102 2 103 1 104 0)
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((reduce-right '(0)
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(lambda (current accumulator) (cons (+ 1 (car accumulator)) (cons current accumulator))))
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'(101 102 103 104)))
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;=============== reduce-left ======================
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(define (reduce-left initial reducer)
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(lambda (values)
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((Y2
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(lambda (f) (lambda (rest accumulator)
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(if (null? rest) accumulator (f (cdr rest) (reducer (car rest) accumulator))))))
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values
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initial)))
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(assert-eq "reduce-left test 1 failed"
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'(4 104 3 103 2 102 1 101 0)
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((reduce-left '(0)
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(lambda (current accumulator) (cons (+ 1 (car accumulator)) (cons current accumulator))))
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'(101 102 103 104)))
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;=============== reverse ======================
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(define reverse (reduce-left '() cons))
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(assert-eq "reverse test 1 failed"
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'(4 3 2 1)
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(reverse '(1 2 3 4)))
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;=============== map ======================
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(define (map mapper) (reduce-right '()
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(lambda (current accumulator) (cons (mapper current) accumulator))))
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(assert-eq "map test 1 failed"
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'(1 4 9 16)
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((map (lambda (x) (* x x)))
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'(1 2 3 4)))
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(assert-eq "map test 2 failed"
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'(1 2 (3 4) 5)
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((map id) '(1 2 (3 4) 5)))
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;=============== concat ======================
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(define (concat left right)
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((reduce-right right (lambda (current accumulator) (cons current accumulator)))
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left))
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(assert-eq "concat test 1 failed"
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'(1 2 3 4 5)
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(concat '(1 2) '(3 4 5)))
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;=============== flat ======================
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(define flat (reduce-right '() concat))
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(assert-eq "flat test 1 failed"
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'(1 2 3 4 5 (6 7) 8)
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(flat '((1 2) () (3 4) (5 (6 7) 8))))
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;=============== filter ======================
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(define (filter predicate) (reduce-right '()
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(lambda (current accumulator)
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(if (predicate current) (cons current accumulator) accumulator))))
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(assert-eq "filter test 1 failed"
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'(2 4 4 2)
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((filter (lambda (x) (= (modulo x 2) 0)))
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'(1 2 3 4 4 3 2 1)))
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;=============== first ======================
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(define (first predicate) (reduce-right '()
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(lambda (current accumulator)
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(if (predicate current) current accumulator))))
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(assert-eq "first with is-not-empty test 1 failed"
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'(1 2 3)
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((first is-not-empty) '(() (1 2 3))))
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;=============== coalesce ======================
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(define (coalesce-not-empty default-lazy) (lambda (value) (if (null? value) (default-lazy) value)))
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(assert-eq "coalesce-not-empty test 1 failed"
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'(1)
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((coalesce-not-empty (lambda () '(1))) '()))
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(assert-eq "coalesce-not-empty test 2 failed"
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'(2)
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((coalesce-not-empty (lambda () '(1))) '(2)))
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(assert-eq "coalesce-not-empty test 3 failed (wrong result)"
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'(2)
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((coalesce-not-empty (lambda () (display-ln "coalesce-not-empty test 3 failed (called default-lazy)")))
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'(2)))
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;=============== truthy-chaining ======================
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(define (truthy-chaining f) (lambda (value) (if value (f value) #f)))
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(assert-eq "coalesce-not-empty test 1 failed"
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2
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((truthy-chaining (lambda (x) (+ x 1))) 1))
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(assert-eq "coalesce-not-empty test 2 failed"
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#f
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((truthy-chaining (lambda (x) (+ x 1))) #f))
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;=============== compose-two ======================
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(define (compose-two f g) (lambda (x) (f (g x))))
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(assert-eq "compose-two test 1 failed"
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6
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((compose-two
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(lambda (x) (* x 2))
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(lambda (x) (+ x 2)))
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1))
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;=============== compose ======================
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(define compose (reduce-right id compose-two))
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(assert-eq "compose test 1 failed"
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'(1 2 3 4)
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((compose (list
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(prepend 1)
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(prepend 2)
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(prepend 3)))
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'(4)))
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;=============== compose ======================
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(define (combine combiner)
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(lambda (a b) (if (null? a) b (if (null? b) a (combiner a b)))))
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(assert-eq "combine test 1 failed"
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'(1 3)
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((combine (lambda (a b) (list (car a) (car b))))
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'(1 2)
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'(3 4)))
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(assert-eq "combine test 1 failed"
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'(1 2)
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((combine (lambda (a b) (list (car a) (car b))))
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'(1 2)
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'()))
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(assert-eq "combine test 1 failed"
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'(3 4)
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((combine (lambda (a b) (list (car a) (car b))))
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'()
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'(3 4)))
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(assert-eq "combine test 1 failed"
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'()
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((combine (lambda (a b) (list (car a) (car b))))
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'()
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'()))
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;=============== sum ======================
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(define sum (reduce-right 0 +))
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(assert-eq "sum test 1 failed"
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6
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(sum '(1 2 3)))
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;=============== min-list ======================
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(define min-list
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(reduce-right #f
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(lambda (current accumulator)
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(if accumulator (min current accumulator) current))))
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(assert-eq "min-list test 1 failed"
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2
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(min-list '(7 3 8 5 2 6 9)))
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(assert-eq "min-list test 2 failed"
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#f
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(min-list '()))
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;=============== repeat ======================
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(define (repeat value) (Y
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(lambda (f) (lambda (n)
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(if (= n 0) '() (cons value (f (- n 1))))))))
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(assert-eq "repeat test 1 failed"
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'(1 1 1)
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((repeat 1) 3))
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;=============== value-by-index ======================
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(define value-by-index (Y2
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(lambda (f) (lambda (values index)
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(if (= index 0) (car values) (f (cdr values) (- index 1)))))))
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(assert-eq "value-by-index test 1 failed"
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12
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(value-by-index '(10 11 12 13 14) 2))
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;=============== split ======================
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(define (split predicate)
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(reduce-right '(())
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(lambda (current accumulator)
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(if
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(predicate current)
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(cons '() accumulator)
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(cons (cons current (car accumulator)) (cdr accumulator))))))
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(assert-eq "split test 1 failed"
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'((1 2) (3 4 5) (6 7))
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((split (is 0))
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'(1 2 0 3 4 5 0 6 7)))
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(assert-eq "split test 2 failed"
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'(() (1 2) () (3 4 5) (6 7) ())
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((split (is 0))
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'(0 1 2 0 0 3 4 5 0 6 7 0)))
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;=============== solution ======================
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(define symbol-current (quote current))
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(define symbol-previous (quote previous))
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(define parse-initial
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(compose (list
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(map (compose (list
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(lambda (number) (list symbol-current number))
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string->number
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list->string)))
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cdr
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(split (is #\space))
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string->list)))
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(define (mark-state-value-previous state-entry) (cons symbol-previous (cdr state-entry)))
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(define (is-state-value-current state-entry) (equal? symbol-current (car state-entry)))
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(define (get-state-value state-entry) (car (cdr state-entry)))
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(define swap-state (compose (list
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#!(tee-with-comment "state after swap")!#
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(map mark-state-value-previous)
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(filter is-state-value-current)
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#!(tee-with-comment "state before swap")!#)))
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(define (create-map numbers) (list
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;; convert it from destination_start, source_start, length
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;; to source_start, source_end, destination_start
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(value-by-index numbers 1)
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(+ (value-by-index numbers 1) (value-by-index numbers 2))
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(value-by-index numbers 0)))
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(define (map-source-start seed-map) (value-by-index seed-map 0))
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(define (map-source-end seed-map) (value-by-index seed-map 1))
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(define (map-destination-start seed-map) (value-by-index seed-map 2))
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(define (apply-map-to-previous-state-value seed-map state-value)
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(if
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(and
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(<= (map-source-start seed-map) state-value)
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(< state-value (map-source-end seed-map)))
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(list symbol-current (+ (- state-value (map-source-start seed-map)) (map-destination-start seed-map)))
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(list symbol-previous state-value)))
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(define (apply-map-to-state-entry seed-map)
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(lambda (state-entry)
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(if
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(is-state-value-current state-entry)
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state-entry
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(apply-map-to-previous-state-value seed-map (get-state-value state-entry)))))
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(define (apply-map-to-state seed-map)
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(map (apply-map-to-state-entry seed-map)))
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(define (seed-maps-processor raw-seed-maps)
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(compose (list
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;; for state
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#!(tee-with-comment "state after applying mapset")!#
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((compose (list
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;; for list of map lines (within a single map set); should return state-transforming lambda
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compose
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(map apply-map-to-state)
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#!(tee-with-comment "current mapset")!#
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(prepend '(0 4294967295 0))
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(map (compose (list
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;; for map line
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create-map
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(map (compose (list
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;; for number in map line
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string->number
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list->string)))
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(split (is #\space))
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string->list
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)))
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#!(tee-with-comment "raw seed maps without prefix")!#
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cdr))
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raw-seed-maps)
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swap-state)))
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(define (final-state lines)
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(((compose (list
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compose
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(map seed-maps-processor)
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reverse
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(filter is-not-empty)
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(split (is ""))))
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(cdr lines))
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(parse-initial (car lines))))
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(define solve-all
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(compose (list
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min-list
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(map get-state-value)
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(filter is-state-value-current)
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final-state)))
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(display (solve-all (read-lines)))
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