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-rw-r--r--2017/src/bin/day01.rs31
1 files changed, 31 insertions, 0 deletions
diff --git a/2017/src/bin/day01.rs b/2017/src/bin/day01.rs
new file mode 100644
index 0000000..ee81d15
--- /dev/null
+++ b/2017/src/bin/day01.rs
@@ -0,0 +1,31 @@
+use std::io::{self, Read};
+
+fn solve(input: &str) -> u32 {
+    let mut sum = 0;
+
+    let chars = input.chars();
+    let nexts = input.chars().cycle().skip(1);
+
+    for (a, b) in chars.zip(nexts) {
+        if a == b {
+            sum += a.to_digit(10).unwrap();
+        }
+    }
+
+    sum
+}
+
+fn main() {
+    let mut input = String::new();
+    io::stdin().read_to_string(&mut input).unwrap();
+
+    println!("Part 1: {}", solve(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"));
+}
:32:37 -0500'>2019-11-07Include path in readlinkat errorJune McEnroe 2019-11-07Call clientConsume before clientRecvJune McEnroe 2019-11-06Use -l:filename in Linux.mkJune McEnroe 2019-11-06Fix compat.h for #defined strlcpyJune McEnroe 2019-11-06Allow unsetting LIBRESSL_PREFIXJune McEnroe 2019-11-06Document calico service configurationJune McEnroe 2019-11-06Document SASL EXTERNAL configuration in more detailJune McEnroe 2019-11-06Document pounce service configurationJune McEnroe 2019-11-06Mention Darwin and GNU/Linux in READMEJune McEnroe 2019-11-06Assume LibreSSL from brew on DarwinJune McEnroe 2019-11-06Remove -DNO_EXPLICIT_BZERO from Darwin.mkJune McEnroe 2019-11-06Don't install rc scripts or dirs on LinuxJune McEnroe