Day 2

3 files changed, 48 insertions, 0 deletions

diff --git a/inputs/day_2.txt b/inputs/day_2.txt
new file mode 100644
index 0000000..f2f1f5e
--- /dev/null
+++ b/inputs/day_2.txt
@@ -0,0 +1,16 @@
+493	458	321	120	49	432	433	92	54	452	41	461	388	409	263	58
+961	98	518	188	958	114	1044	881	948	590	972	398	115	116	451	492
+76	783	709	489	617	72	824	452	748	737	691	90	94	77	84	756
+204	217	90	335	220	127	302	205	242	202	259	110	118	111	200	112
+249	679	4015	106	3358	1642	228	4559	307	193	4407	3984	3546	2635	3858	924
+1151	1060	2002	168	3635	3515	3158	141	4009	3725	996	142	3672	153	134	1438
+95	600	1171	1896	174	1852	1616	928	79	1308	2016	88	80	1559	1183	107
+187	567	432	553	69	38	131	166	93	132	498	153	441	451	172	575
+216	599	480	208	224	240	349	593	516	450	385	188	482	461	635	220
+788	1263	1119	1391	1464	179	1200	621	1304	55	700	1275	226	57	43	51
+1571	58	1331	1253	60	1496	1261	1298	1500	1303	201	73	1023	582	69	339
+80	438	467	512	381	74	259	73	88	448	386	509	346	61	447	435
+215	679	117	645	137	426	195	619	268	223	792	200	720	260	303	603
+631	481	185	135	665	641	492	408	164	132	478	188	444	378	633	516
+1165	1119	194	280	223	1181	267	898	1108	124	618	1135	817	997	129	227
+404	1757	358	2293	2626	87	613	95	1658	147	75	930	2394	2349	86	385
diff --git a/src/bin/day_2.rs b/src/bin/day_2.rs
new file mode 100644
index 0000000..307029a
--- /dev/null
+++ b/src/bin/day_2.rs
@@ -0,0 +1,26 @@
+extern crate advent_of_code_2017;
+use advent_of_code_2017::*;
+
+fn main() {
+    let args = AdventArgs::init();
+    let sum = args.input.iter().map(|line| {
+        let splitline = parse_space_separated_ints(line).unwrap();
+        
+        if args.part == 1 {
+            let max = splitline.iter().max().unwrap();
+            let min = splitline.iter().min().unwrap();
+            max-min
+        } else {
+            for i in 0..splitline.len() {
+                for j in 0..splitline.len() {
+                    if i != j && splitline[i] % splitline[j] == 0  {
+                        return splitline[i] / splitline[j];
+                    }
+                }
+            }
+            panic!("Didn't find a dividing one! {:?}", splitline)
+        }
+    }).sum::<i32>();
+
+    println!("Checksum is {}", sum);
+}
diff --git a/src/lib.rs b/src/lib.rs
index c5a0f16..5d3721f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -59,3 +59,9 @@ impl AdventArgs {
             .collect()
     }
 }
+
+pub fn parse_space_separated_ints(line: &String) -> Result<Vec<i32>, std::num::ParseIntError> {
+    line.split_whitespace()
+        .map(|x| x.parse::<i32>())
+        .collect()
+}