Day 1: Replaced comment box with block comment.
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#reader(lib"read.ss""wxme")WXME0108 ##
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#lang racket
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(require "../lib.rkt")
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#|
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This file uses the GRacket editor format.
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Open this file in DrRacket version 7.0 or later to read it.
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DAY 1: The Tyranny of the Rocket Equation (excerpt)
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Most likely, it was created by saving a program in DrRacket,
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and it probably contains a program with non-text elements
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(such as images or comment boxes).
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PART 1:
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...
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Fuel required to launch a given module is based on its mass.
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Specifically, to find the fuel required for a module, take its mass,
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divide by three, round down, and subtract 2.
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...
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What is the sum of the fuel requirements for all of the modules
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on your spacecraft?
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http://racket-lang.org/
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PART 2:
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...
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So, for each module mass, calculate its fuel and add it to the total.
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Then, treat the fuel amount you just calculated as the input mass
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and repeat the process, continuing until a fuel requirement is zero
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or negative.
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...
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What is the sum of the fuel requirements for all of the modules
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on your spacecraft when also taking into account the mass of the
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added fuel?
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|#
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33 7 #"wxtext\0"
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3 1 6 #"wxtab\0"
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1 1 8 #"wximage\0"
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2 0 8 #"wxmedia\0"
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1 0 36 #"(lib \"cache-image-snip.ss\" \"mrlib\")\0"
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1 0 68
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(
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#"((lib \"image-core.ss\" \"mrlib\") (lib \"image-core-wxme.rkt\" \"mr"
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#"lib\"))\0"
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) 1 0 16 #"drscheme:number\0"
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1 0 93
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(
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#"((lib \"collapsed-snipclass.ss\" \"framework\") (lib \"collapsed-sni"
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#"pclass-wxme.ss\" \"framework\"))\0"
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0 0 29 #"drscheme:bindings-snipclass%\0"
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1 0 101
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(
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#"((lib \"ellipsis-snip.rkt\" \"drracket\" \"private\") (lib \"ellipsi"
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#"s-snip-wxme.rkt\" \"drracket\" \"private\"))\0"
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) 2 0 88
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(
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#"((lib \"pict-snip.rkt\" \"drracket\" \"private\") (lib \"pict-snip.r"
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#"kt\" \"drracket\" \"private\"))\0"
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) 0 0 55
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#"((lib \"snip.rkt\" \"pict\") (lib \"snip-wxme.rkt\" \"pict\"))\0"
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1 0 34 #"(lib \"bullet-snip.rkt\" \"browser\")\0"
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0 0 25 #"(lib \"matrix.ss\" \"htdp\")\0"
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0 0 57
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#"(lib \"hrule-snip.rkt\" \"macro-debugger\" \"syntax-browser\")\0"
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1 0 26 #"drscheme:pict-value-snip%\0"
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0 0 45 #"(lib \"image-snipr.ss\" \"slideshow\" \"private\")\0"
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1 0 38 #"(lib \"pict-snipclass.ss\" \"slideshow\")\0"
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2 0 55 #"(lib \"vertical-separator-snip.ss\" \"stepper\" \"private\")\0"
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#"framework:syntax-color:scheme:hash-colon-keyword\0"
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0 -1 1 #"\0"
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4 1 #"\0"
|
||||
0 -1 1 #"\0"
|
||||
1 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 255 228 225 -1 -1 4
|
||||
1 #"\0"
|
||||
0 -1 1 #"\0"
|
||||
1 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 224 255 255 -1 -1 4
|
||||
1 #"\0"
|
||||
0 -1 1 #"\0"
|
||||
1.0 0 92 -1 -1 -1 -1 -1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 255 255 0 -1 -1
|
||||
0 142 0 28 3 12 #"#lang racket"
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
0 0 14 3 3 #"The"
|
||||
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|
||||
0 0 14 3 7 #"Tyranny"
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
0 0 24 3 1 #" "
|
||||
0 0 14 3 2 #"to"
|
||||
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|
||||
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|
||||
0 0 24 3 1 #" "
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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||||
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||||
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||||
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||||
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||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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||||
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|
||||
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||||
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|
||||
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|
||||
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|
||||
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|
||||
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||||
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|
||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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|
||||
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||||
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||||
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|
||||
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||||
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|
||||
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||||
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||||
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||||
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||||
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||||
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||||
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|
||||
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|
||||
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||||
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||||
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|
||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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|
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||||
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|
||||
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|
||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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|
||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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|
||||
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|
||||
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|
||||
0 0 24 29 1 #"\n"
|
||||
0 0 24 3 1 #"("
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||||
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|
||||
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|
||||
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|
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|
||||
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||||
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|
||||
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|
||||
0 0 24 3 1 #" "
|
||||
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|
||||
0 0 24 3 3 #")))"
|
||||
0 0 24 29 1 #"\n"
|
||||
0 0 24 29 1 #"\n"
|
||||
0 0 17 3 31 #";; calc-fuel : number -> number"
|
||||
0 0 24 29 1 #"\n"
|
||||
0 0 24 3 1 #"("
|
||||
0 0 15 3 6 #"define"
|
||||
0 0 24 3 2 #" ("
|
||||
0 0 14 3 9 #"calc-fuel"
|
||||
0 0 24 3 1 #" "
|
||||
0 0 14 3 4 #"mass"
|
||||
0 0 24 3 1 #")"
|
||||
0 0 24 29 1 #"\n"
|
||||
0 0 24 3 3 #" ("
|
||||
0 0 14 3 1 #"-"
|
||||
0 0 24 3 2 #" ("
|
||||
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|
||||
0 0 24 3 2 #" ("
|
||||
0 0 14 3 1 #"/"
|
||||
0 0 24 3 1 #" "
|
||||
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|
||||
0 0 24 3 1 #" "
|
||||
0 0 21 3 1 #"3"
|
||||
0 0 24 3 3 #")) "
|
||||
0 0 21 3 1 #"2"
|
||||
0 0 24 3 2 #"))"
|
||||
0 0 24 29 1 #"\n"
|
||||
0 0 24 29 1 #"\n"
|
||||
0 0 24 3 1 #"("
|
||||
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|
||||
0 0 24 3 1 #" "
|
||||
0 0 14 3 5 #"part1"
|
||||
0 0 24 29 1 #"\n"
|
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0 0 24 3 3 #" ("
|
||||
0 0 14 3 3 #"sum"
|
||||
0 0 24 3 2 #" ("
|
||||
0 0 14 3 3 #"map"
|
||||
0 0 24 3 1 #" "
|
||||
0 0 14 3 9 #"calc-fuel"
|
||||
0 0 24 3 1 #" "
|
||||
0 0 14 3 5 #"input"
|
||||
0 0 24 3 3 #")))"
|
||||
0 0 24 29 1 #"\n"
|
||||
0 0 24 29 1 #"\n"
|
||||
0 0 17 3 35 #";; calc-fuel-rec : number -> number"
|
||||
0 0 24 29 1 #"\n"
|
||||
0 0 17 3 35 #";; Calculate the fuel given a mass,"
|
||||
0 0 24 29 1 #"\n"
|
||||
0 0 17 3 44 #";; then add the fuel required for THAT fuel,"
|
||||
0 0 24 29 1 #"\n"
|
||||
0 0 17 3 54 #";; and so on until the fuel required is 0 or negative,"
|
||||
0 0 24 29 1 #"\n"
|
||||
0 0 17 3 39 #";; for which the fuel should just be 0."
|
||||
0 0 24 29 1 #"\n"
|
||||
0 0 24 3 1 #"("
|
||||
0 0 15 3 6 #"define"
|
||||
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|
||||
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|
||||
0 0 24 3 1 #" "
|
||||
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|
||||
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|
||||
0 0 24 29 1 #"\n"
|
||||
0 0 24 3 3 #" ("
|
||||
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|
||||
0 0 24 3 3 #" (["
|
||||
0 0 14 3 4 #"fuel"
|
||||
0 0 24 3 2 #" ("
|
||||
0 0 14 3 9 #"calc-fuel"
|
||||
0 0 24 3 1 #" "
|
||||
0 0 14 3 4 #"mass"
|
||||
0 0 24 3 3 #")])"
|
||||
0 0 24 29 1 #"\n"
|
||||
0 0 24 3 5 #" ("
|
||||
0 0 14 3 2 #"if"
|
||||
0 0 24 3 2 #" ("
|
||||
0 0 14 3 2 #"<="
|
||||
0 0 24 3 1 #" "
|
||||
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|
||||
0 0 24 3 1 #" "
|
||||
0 0 21 3 1 #"0"
|
||||
0 0 24 3 2 #") "
|
||||
0 0 21 3 1 #"0"
|
||||
0 0 24 29 1 #"\n"
|
||||
0 0 24 3 9 #" ("
|
||||
0 0 14 3 1 #"+"
|
||||
0 0 24 3 1 #" "
|
||||
0 0 14 3 4 #"fuel"
|
||||
0 0 24 3 2 #" ("
|
||||
0 0 14 3 13 #"calc-fuel-rec"
|
||||
0 0 24 3 1 #" "
|
||||
0 0 14 3 4 #"fuel"
|
||||
0 0 24 3 5 #")))))"
|
||||
0 0 24 29 1 #"\n"
|
||||
0 0 24 29 1 #"\n"
|
||||
0 0 24 3 1 #"("
|
||||
0 0 15 3 6 #"define"
|
||||
0 0 24 3 1 #" "
|
||||
0 0 14 3 5 #"part2"
|
||||
0 0 24 29 1 #"\n"
|
||||
0 0 24 3 3 #" ("
|
||||
0 0 14 3 3 #"sum"
|
||||
0 0 24 3 2 #" ("
|
||||
0 0 14 3 3 #"map"
|
||||
0 0 24 3 1 #" "
|
||||
0 0 14 3 13 #"calc-fuel-rec"
|
||||
0 0 24 3 1 #" "
|
||||
0 0 14 3 5 #"input"
|
||||
0 0 24 3 3 #")))"
|
||||
0 0 24 29 1 #"\n"
|
||||
0 0 24 29 1 #"\n"
|
||||
0 0 24 3 1 #"("
|
||||
0 0 14 3 13 #"show-solution"
|
||||
0 0 24 3 1 #" "
|
||||
0 0 14 3 5 #"part1"
|
||||
0 0 24 3 1 #" "
|
||||
0 0 14 3 5 #"part2"
|
||||
0 0 24 3 1 #")"
|
||||
0 0
|
||||
|
||||
(define input (map string->number (problem-input 1)))
|
||||
|
||||
;; calc-fuel : number -> number
|
||||
(define (calc-fuel mass)
|
||||
(- (floor (/ mass 3)) 2))
|
||||
|
||||
(define part1
|
||||
(sum (map calc-fuel input)))
|
||||
|
||||
;; calc-fuel-rec : number -> number
|
||||
;; Calculate the fuel given a mass,
|
||||
;; then add the fuel required for THAT fuel,
|
||||
;; and so on until the fuel required is 0 or negative,
|
||||
;; for which the fuel should just be 0.
|
||||
(define (calc-fuel-rec mass)
|
||||
(let ([fuel (calc-fuel mass)])
|
||||
(if (<= fuel 0) 0
|
||||
(+ fuel (calc-fuel-rec fuel)))))
|
||||
|
||||
(define part2
|
||||
(sum (map calc-fuel-rec input)))
|
||||
|
||||
(show-solution part1 part2)
|
||||
Loading…
Reference in New Issue