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https://github.com/RussellChamp/advent-of-code-2016.git
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Day 15 solution
This commit is contained in:
Russell Champoux committed
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+187
@@ -0,0 +1,187 @@
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[root]
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name = "day15"
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version = "0.1.0"
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dependencies = [
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"num 0.1.36 (registry+https://github.com/rust-lang/crates.io-index)",
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"regex 0.1.80 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "aho-corasick"
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version = "0.5.3"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"memchr 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "kernel32-sys"
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version = "0.2.2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
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"winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "libc"
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version = "0.2.18"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "memchr"
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version = "0.1.11"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"libc 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "num"
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version = "0.1.36"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"num-bigint 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)",
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"num-complex 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)",
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"num-integer 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
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"num-iter 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
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"num-rational 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)",
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"num-traits 0.1.36 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "num-bigint"
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version = "0.1.35"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"num-integer 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
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"num-traits 0.1.36 (registry+https://github.com/rust-lang/crates.io-index)",
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"rand 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)",
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"rustc-serialize 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "num-complex"
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version = "0.1.35"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"num-traits 0.1.36 (registry+https://github.com/rust-lang/crates.io-index)",
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"rustc-serialize 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "num-integer"
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version = "0.1.32"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"num-traits 0.1.36 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "num-iter"
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version = "0.1.32"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"num-integer 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
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"num-traits 0.1.36 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "num-rational"
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version = "0.1.35"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"num-bigint 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)",
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"num-integer 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
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"num-traits 0.1.36 (registry+https://github.com/rust-lang/crates.io-index)",
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"rustc-serialize 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "num-traits"
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version = "0.1.36"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "rand"
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version = "0.3.15"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"libc 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "regex"
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version = "0.1.80"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"aho-corasick 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
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"memchr 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
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"regex-syntax 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
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"thread_local 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
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"utf8-ranges 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "regex-syntax"
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version = "0.3.9"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "rustc-serialize"
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version = "0.3.22"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "thread-id"
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version = "2.0.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
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"libc 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "thread_local"
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version = "0.2.7"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"thread-id 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "utf8-ranges"
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version = "0.1.3"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "winapi"
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version = "0.2.8"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "winapi-build"
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version = "0.1.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[metadata]
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"checksum libc 0.2.18 (registry+https://github.com/rust-lang/crates.io-index)" = "a51822fc847e7a8101514d1d44e354ba2ffa7d4c194dcab48870740e327cac70"
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"checksum memchr 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)" = "d8b629fb514376c675b98c1421e80b151d3817ac42d7c667717d282761418d20"
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"checksum num-complex 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)" = "f0c78e054dd19c3fd03419ade63fa661e9c49bb890ce3beb4eee5b7baf93f92f"
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"checksum num-iter 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)" = "287a1c9969a847055e1122ec0ea7a5c5d6f72aad97934e131c83d5c08ab4e45c"
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"checksum num-rational 0.1.35 (registry+https://github.com/rust-lang/crates.io-index)" = "54ff603b8334a72fbb27fe66948aac0abaaa40231b3cecd189e76162f6f38aaf"
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"checksum num-traits 0.1.36 (registry+https://github.com/rust-lang/crates.io-index)" = "a16a42856a256b39c6d3484f097f6713e14feacd9bfb02290917904fae46c81c"
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"checksum rand 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)" = "022e0636ec2519ddae48154b028864bdce4eaf7d35226ab8e65c611be97b189d"
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"checksum regex 0.1.80 (registry+https://github.com/rust-lang/crates.io-index)" = "4fd4ace6a8cf7860714a2c2280d6c1f7e6a413486c13298bbc86fd3da019402f"
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"checksum regex-syntax 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)" = "f9ec002c35e86791825ed294b50008eea9ddfc8def4420124fbc6b08db834957"
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"checksum rustc-serialize 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)" = "237546c689f20bb44980270c73c3b9edd0891c1be49cc1274406134a66d3957b"
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"checksum thread-id 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a9539db560102d1cef46b8b78ce737ff0bb64e7e18d35b2a5688f7d097d0ff03"
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"checksum thread_local 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)" = "8576dbbfcaef9641452d5cf0df9b0e7eeab7694956dd33bb61515fb8f18cfdd5"
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"checksum utf8-ranges 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a1ca13c08c41c9c3e04224ed9ff80461d97e121589ff27c753a16cb10830ae0f"
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"checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
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"checksum winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
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@@ -0,0 +1,8 @@
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[package]
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name = "day15"
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version = "0.1.0"
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authors = ["~krowbar"]
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[dependencies]
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regex = "0.1"
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num = "0.1"
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@@ -0,0 +1,75 @@
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extern crate regex;
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extern crate num;
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use regex::Regex;
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use num::Integer;
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use std::io::Read;
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use std::fs::File;
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#[derive(Debug, Clone, Copy)]
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struct Disc {
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id: u32,
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pos: u32,
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start: u32
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}
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fn is_valid(disc: &Disc, time: u32) -> bool {
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// a disk starts at position 'start'
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// and ticks up to maximum position 'pos' then loops back to the first position
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// a disk will be valid if it is at position 0 when hit
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// there is a delay of seconds equal to the disc layer, or "id"
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(disc.start + time + disc.id) % disc.pos == 0
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}
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fn get_discs(input: &String) -> Vec<Disc> {
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let mut discs: Vec<Disc> = vec![];
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let re = Regex::new(r"Disc #(\d+) has (\d+) positions; at time=0, it is at position (\d+)\.").unwrap();
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//read all discs
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for line in input.lines() {
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let cap = re.captures(line).unwrap();
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discs.push(Disc {
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id: cap.at(1).unwrap().parse().unwrap(),
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pos: cap.at(2).unwrap().parse().unwrap(),
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start: cap.at(3).unwrap().parse().unwrap()
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});
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}
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//println!("Discs: {:?}", discs);
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discs
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}
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fn cycle_discs(discs: &Vec<Disc>) {
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//find full cycle length (through lowest common multiple of all disc positions)
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let full_cycle = discs.iter().fold(1, |total, x| total.lcm(&x.pos));
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//println!("LCM {}", full_cycle);
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//iterate through each cycle until you find a match
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'time_loop: for time in 0..full_cycle {
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for disc in discs {
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if !is_valid(disc, time) {
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continue 'time_loop;
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}
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}
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//we made it all the way through the discs!
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println!("We made it at time={}", time);
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break 'time_loop;
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}
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}
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fn main() {
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let mut file = File::open("./data").expect("could not open file");
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let mut input = String::new();
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file.read_to_string(&mut input).expect("could not read file");
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// Part 1
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print!("Part 1: ");
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let mut discs = get_discs(&input);
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cycle_discs(&discs);
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// Part 2
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print!("Part 2: ");
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let new_id = (discs.len() + 1) as u32;
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discs.push(Disc {id: new_id, pos: 11, start: 0 });
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cycle_discs(&discs);
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}
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