summary refs log tree commit diff homepage
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--2017/src/bin/day01.rs28
1 files changed, 21 insertions, 7 deletions
diff --git a/2017/src/bin/day01.rs b/2017/src/bin/day01.rs
index ee81d15..70ca5a6 100644
--- a/2017/src/bin/day01.rs
+++ b/2017/src/bin/day01.rs
@@ -1,10 +1,10 @@
 use std::io::{self, Read};
 
-fn solve(input: &str) -> u32 {
+fn solve(input: &str, skip: usize) -> u32 {
     let mut sum = 0;
 
     let chars = input.chars();
-    let nexts = input.chars().cycle().skip(1);
+    let nexts = input.chars().cycle().skip(skip);
 
     for (a, b) in chars.zip(nexts) {
         if a == b {
@@ -15,17 +15,31 @@ fn solve(input: &str) -> u32 {
     sum
 }
 
+fn solve2(input: &str) -> u32 {
+    solve(input, input.len() / 2)
+}
+
 fn main() {
     let mut input = String::new();
     io::stdin().read_to_string(&mut input).unwrap();
 
-    println!("Part 1: {}", solve(input.trim()));
+    println!("Part 1: {}", solve(input.trim(), 1));
+    println!("Part 2: {}", solve2(input.trim()));
 }
 
 #[test]
 fn part1() {
-    assert_eq!(3, solve("1122"));
-    assert_eq!(4, solve("1111"));
-    assert_eq!(0, solve("1234"));
-    assert_eq!(9, solve("91212129"));
+    assert_eq!(3, solve("1122", 1));
+    assert_eq!(4, solve("1111", 1));
+    assert_eq!(0, solve("1234", 1));
+    assert_eq!(9, solve("91212129", 1));
+}
+
+#[test]
+fn part2() {
+    assert_eq!(6, solve2("1212"));
+    assert_eq!(0, solve2("1221"));
+    assert_eq!(4, solve2("123425"));
+    assert_eq!(12, solve2("123123"));
+    assert_eq!(4, solve2("12131415"));
 }
='3' class='logmsg'> Copied from the OpenBSD defaults. 2021-01-26Use First state to match keyword at beginning of lineJune McEnroe Otherwise keywords at the beginnings of lines with preceeding whitespace are not matched. 2021-01-25Install vi on Linux and nvi on macOSJune McEnroe 2021-01-25Use vi and lessJune McEnroe I haven't used neovim in a couple weeks by now, so I may as well commit this. 2021-01-20Use mtags for sh in source-filterJune McEnroe 2021-01-20Generate tags for sh files in mtagsJune McEnroe Only matches functions declared at the beginnings of lines, but I'm fine with that. 2021-01-20Add messy sh lexerJune McEnroe Surprisingly seems to work for everything I looked at in my repos. 2021-01-20Add all target to git.causal.agency MakefileJune McEnroe 2021-01-20Remove Lua supportJune McEnroe Lua support is unused and the dlsym fwrite/write hacks horrify me. Clean it up. 2021-01-20Fix tests for diff spansJune McEnroe 2021-01-20Avoid matching ':' in make tagsJune McEnroe Otherwise a :: rule includes one of the ':'s in the tag name. 2021-01-19Prefer tag matches not preceded by [[:alnum:]]June McEnroe Otherwise the "id" in "void" matches for "void id". 2021-01-19Escape \ and / in mtags search patternsJune McEnroe 2021-01-20Use mtags in source-filterJune McEnroe 2021-01-19Add mtags to generate tags for make and mdocJune McEnroe 2021-01-19Map tags to IDs using only [[:alnum:]-._]June McEnroe 2021-01-19Don't use a pager if reading standard inputJune McEnroe 2021-01-19Support BSD make syntax and match *.amJune McEnroe These don't really go together, but... 2021-01-19Match tab following escaped newline in make assignmentsJune McEnroe Otherwise it ends up going into Shell state. 2021-01-18Allow matching lexers using first input lineJune McEnroe