1 files changed, 49 insertions, 0 deletions
diff --git a/src/day4pt2.rs b/src/day4pt2.rs
new file mode 100644
index 0000000..765e992
--- /dev/null
+++ b/src/day4pt2.rs
@@ -0,0 +1,49 @@
+pub fn main() {
+    let txt = std::fs::read_to_string("./input/day4.txt").unwrap();
+    let mut sum: u32 = 0;
+    let mut a = vec![1; 256];
+
+    for (idx, line) in txt.lines().enumerate() {
+        let mut cnt: u32 = 0;
+
+        let mut br1 = vec![];
+        let mut br2 = vec![];
+
+        let sec_pt = line
+            .split(": ")
+            .collect::<Vec<&str>>()
+            .get(1)
+            .unwrap()
+            .split(" | ")
+            .collect::<Vec<&str>>();
+        for i in sec_pt.get(0).unwrap().split(r" ") {
+            if i == "" {
+                continue;
+            }
+            br1.push(i.parse::<u32>().unwrap());
+        }
+
+        for i in sec_pt.get(1).unwrap().split(r" ") {
+            if i == "" {
+                continue;
+            }
+            br2.push(i.parse::<u32>().unwrap());
+        }
+
+        for i in &br1 {
+            for j in &br2 {
+                if i == j {
+                    cnt += 1;
+                }
+            }
+        }
+
+        for i in 1..cnt + 1 {
+            a[idx + i as usize] += a[idx];
+        }
+
+        sum += a[idx];
+    }
+
+    println!("{}", sum);
+}