From f86be23eca2107c5f7d775fd7e2818e80905c7d0 Mon Sep 17 00:00:00 2001
From: Baipyrus <simon.waltemathe@gmail.com>
Date: Wed, 24 Jan 2024 22:58:19 +0100
Subject: [PATCH] calculate sum of expanded values

---
 src/day09/mod.rs | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/src/day09/mod.rs b/src/day09/mod.rs
index 1ae6619..a6c6f9f 100644
--- a/src/day09/mod.rs
+++ b/src/day09/mod.rs
@@ -9,22 +9,24 @@ pub fn main() {
     let input = split_inputs(lines, &r"\s+");
 
     let sequences = convert_num(input);   
-    let structures: Vec<Vec<Vec<i32>>> = sequences
+    let predictions: Vec<i32> = sequences
         .iter()
         .map(|s| {
             let current = s.to_vec();
             let mut next = extra_diff(current);
             expand(&mut next);
-            next
+            next.first()
+                .unwrap()
+                .last()
+                .unwrap()
+                .clone()
         })
         .collect();
-
-    for seq in structures[0].clone() {
-        for n in seq {
-            print!("{n} ");
-        }
-        println!("");
-    }
+    let sum: i32 = predictions
+        .iter()
+        .sum();
+    
+    println!("The sum of all prediction values is: '{sum}'.");
 }
 
 fn expand(strct: &mut Vec<Vec<i32>>) {