Day 5

1 files changed, 31 insertions, 0 deletions

diff --git a/2017/src/bin/day05.rs b/2017/src/bin/day05.rs
new file mode 100644
index 0000000..b8e21d9
--- /dev/null
+++ b/2017/src/bin/day05.rs
@@ -0,0 +1,31 @@
+use std::io::{self, Read};
+
+fn solve1(input: &str) -> u32 {
+    let mut jumps: Vec<isize> = input.lines()
+        .map(str::parse)
+        .map(Result::unwrap)
+        .collect();
+
+    let mut index = 0isize;
+    for step in 0.. {
+        if index < 0 || index >= jumps.len() as isize {
+            return step;
+        }
+        let jump = &mut jumps[index as usize];
+        index += *jump;
+        *jump += 1;
+    }
+    unreachable!()
+}
+
+fn main() {
+    let mut input = String::new();
+    io::stdin().read_to_string(&mut input).unwrap();
+
+    println!("Part 1: {}", solve1(&input));
+}
+
+#[test]
+fn part1() {
+    assert_eq!(5, solve1("0\n3\n0\n1\n-3\n"));
+}