day9

3 files changed, 82 insertions, 4 deletions

diff --git a/src/day9pt1.rs b/src/day9pt1.rs
new file mode 100644
index 0000000..fa6b18f
--- /dev/null
+++ b/src/day9pt1.rs
@@ -0,0 +1,39 @@
+pub fn main() {
+    let txt = std::fs::read_to_string("./input/day9.txt").unwrap();
+    let mut sum: i64 = 0;
+
+    for line in txt.lines() {
+        let mut razlike_all = vec![];
+        let mut razlike = vec![];
+        let mut brojevi: Vec<i64> = line.split(" ").map(|s| s.parse::<i64>().unwrap()).collect();
+
+        razlike_all.push(brojevi.clone());
+        while !brojevi.is_empty() {
+            let mut ind: bool = true;
+            for i in 0..brojevi.len() {
+                if brojevi[i] != 0 {
+                    ind = false;
+                }
+            }
+            if ind {
+                break;
+            }
+
+            for i in 0..brojevi.len() - 1 {
+                razlike.push(brojevi[i + 1] - brojevi[i]);
+            }
+            razlike_all.push(razlike.clone());
+            brojevi = razlike.clone();
+            razlike.clear();
+        }
+
+        let mut sl: i64 = 0;
+        for i in razlike_all {
+            sl += i[i.len() - 1] as i64;
+        }
+
+        sum += sl;
+    }
+
+    println!("{}", sum);
+}
diff --git a/src/day9pt2.rs b/src/day9pt2.rs
new file mode 100644
index 0000000..67324ea
--- /dev/null
+++ b/src/day9pt2.rs
@@ -0,0 +1,39 @@
+pub fn main() {
+    let txt = std::fs::read_to_string("./input/day9.txt").unwrap();
+    let mut sum: i64 = 0;
+
+    for line in txt.lines() {
+        let mut razlike_all = vec![];
+        let mut razlike = vec![];
+        let mut brojevi: Vec<i64> = line.split(" ").map(|s| s.parse::<i64>().unwrap()).collect();
+
+        razlike_all.push(brojevi.clone());
+        while !brojevi.is_empty() {
+            let mut ind: bool = true;
+            for i in 0..brojevi.len() {
+                if brojevi[i] != 0 {
+                    ind = false;
+                }
+            }
+            if ind {
+                break;
+            }
+
+            for i in 0..brojevi.len() - 1 {
+                razlike.push(brojevi[i + 1] - brojevi[i]);
+            }
+            razlike_all.push(razlike.clone());
+            brojevi = razlike.clone();
+            razlike.clear();
+        }
+
+        let mut trn: i64 = 0;
+        for i in 0..razlike_all.len() {
+            trn = razlike_all[razlike_all.len() - 1 - i][0] as i64 - trn;
+        }
+
+        sum += trn;
+    }
+
+    println!("{}", sum);
+}
diff --git a/src/main.rs b/src/main.rs
index 1749ed4..3f23276 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,7 +1,7 @@
-mod day8pt1;
-mod day8pt2;
+mod day9pt1;
+mod day9pt2;
 
 fn main() {
-    day8pt1::main();
-    day8pt2::main();
+    day9pt1::main();
+    day9pt2::main();
 }