From 4641b367cf397f05440cc042d9ef0fc700278cff Mon Sep 17 00:00:00 2001
From: Jan Tuomi <jan.tuomi@eficode.com>
Date: Wed, 5 Dec 2018 15:44:41 +0200
Subject: Solve day 1.2

---
 day1/src/main.rs | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

(limited to 'day1')

diff --git a/day1/src/main.rs b/day1/src/main.rs
index f9b93ce..972b1ee 100644
--- a/day1/src/main.rs
+++ b/day1/src/main.rs
@@ -3,6 +3,7 @@ use std::io::BufReader;
 use std::io::BufRead;
 use std::fs::File;
 use std::process;
+use std::collections::HashSet;
 
 fn main() {
   let args: Vec<String> = env::args().collect();
@@ -22,6 +23,7 @@ fn main() {
   let file = BufReader::new(&f);
 
   let mut diffs: Vec<i32> = Vec::new();
+  // exercise 1
   for line in file.lines() {
     let l = line.unwrap();
     let res = l.parse::<i32>();
@@ -37,5 +39,20 @@ fn main() {
   }
 
   let result: i32 = diffs.iter().fold(0, |acc, x| acc + x);
-  println!("{}", result);
+  println!("Exercise 1: {}", result);
+
+  // exercise 2
+  let mut found = HashSet::new();
+  found.insert(0);
+  let mut sum = 0;
+  loop {
+    for diff in &diffs {
+      sum = sum + diff;
+      if found.contains(&sum) {
+        println!("Exercise 2: {}", &sum);
+        process::exit(0);
+      }
+      found.insert(sum);
+    }
+  }
 }
-- 
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