From db04441437a0bf065e1f642735f8309ac259a49b Mon Sep 17 00:00:00 2001
From: Ben C <bwc9876@gmail.com>
Date: Sat, 6 Dec 2025 01:20:36 -0500
Subject: [PATCH] Day 6

---
 years/2025/src/day_6.rs             | 104 ++++++++++++++++++++++++++--
 years/2025/src/examples/day_6/1.txt |   4 ++
 years/2025/src/examples/day_6/2.txt |   4 ++
 3 files changed, 106 insertions(+), 6 deletions(-)

diff --git a/years/2025/src/day_6.rs b/years/2025/src/day_6.rs
index d49f739..6103119 100644
--- a/years/2025/src/day_6.rs
+++ b/years/2025/src/day_6.rs
@@ -1,17 +1,109 @@
-
 use advent_core::{Day, day_stuff, ex_for_day};
 
 pub struct Day6;
 
+#[derive(Debug, Clone)]
+pub enum Prob {
+    Add(Vec<usize>),
+    Mul(Vec<usize>),
+}
+
 impl Day for Day6 {
+    day_stuff!(6, "4277556", "3263827");
+
+    fn part_1(input: Self::Input) -> Option<String> {
+        let uno = input.lines().collect::<Vec<_>>();
+        let dos = uno
+            .iter()
+            .take(uno.len() - 1)
+            .map(|l| {
+                l.split_whitespace()
+                    .map(|p| p.parse::<usize>().unwrap())
+                    .collect::<Vec<_>>()
+            })
+            .collect::<Vec<_>>();
+        let ops = uno
+            .iter()
+            .skip(uno.len() - 1)
+            .next()
+            .unwrap()
+            .split_whitespace()
+            .collect::<Vec<_>>();
+        let mut problems = Vec::with_capacity(uno.len());
+
+        for i in 0..dos[0].len() {
+            let all_operands = dos.iter().map(|d| d[i]).collect::<Vec<_>>();
+            let operator = ops[i];
+            let prob = if operator == "*" {
+                Prob::Mul(all_operands)
+            } else {
+                Prob::Add(all_operands)
+            };
+
+            problems.push(prob);
+        }
 
-    day_stuff!(6, "", "");
+        let ans = problems
+            .into_iter()
+            .map(|p| match p {
+                Prob::Add(l) => l.iter().sum::<usize>(),
+                Prob::Mul(l) => l.iter().copied().reduce(|a, b| a * b).unwrap(),
+            })
+            .sum::<usize>();
 
-    fn part_1(_input: Self::Input) -> Option<String> {
-        None
+        Some(ans.to_string())
     }
 
-    fn part_2(_input: Self::Input) -> Option<String> {
-        None
+    fn part_2(input: Self::Input) -> Option<String> {
+        let mut cols: Vec<Vec<_>> = vec![];
+
+        for (_, row) in input.lines().enumerate() {
+            for (j, c) in row.chars().enumerate() {
+                if let Some(r) = cols.get_mut(j) {
+                    r.push(c);
+                } else {
+                    cols.push(vec![c]);
+                }
+            }
+        }
+
+        let mut curr_val = 0;
+        let mut curr_op: Option<char> = None;
+        let mut tot = 0;
+
+        for col in cols {
+            if let Some(op) = curr_op {
+                if col.iter().all(|c| *c == ' ') {
+                    tot += curr_val;
+                    curr_val = 0_usize;
+                    curr_op = None;
+                } else {
+                    let num = col
+                        .iter()
+                        .collect::<String>()
+                        .trim()
+                        .parse::<usize>()
+                        .unwrap();
+                    if op == '+' {
+                        curr_val += num;
+                    } else {
+                        curr_val *= num;
+                    }
+                }
+            } else {
+                curr_op = Some(col.last().copied().unwrap());
+                curr_val = col
+                    .iter()
+                    .take(col.len() - 1)
+                    .collect::<String>()
+                    .trim()
+                    .parse::<usize>()
+                    .unwrap();
+            }
+        }
+
+        tot += curr_val;
+
+        Some(tot.to_string())
     }
 }
diff --git a/years/2025/src/examples/day_6/1.txt b/years/2025/src/examples/day_6/1.txt
index e69de29..337b837 100644
--- a/years/2025/src/examples/day_6/1.txt
+++ b/years/2025/src/examples/day_6/1.txt
@@ -0,0 +1,4 @@
+123 328  51 64 
+ 45 64  387 23 
+  6 98  215 314
+*   +   *   +  
diff --git a/years/2025/src/examples/day_6/2.txt b/years/2025/src/examples/day_6/2.txt
index e69de29..337b837 100644
--- a/years/2025/src/examples/day_6/2.txt
+++ b/years/2025/src/examples/day_6/2.txt
@@ -0,0 +1,4 @@
+123 328  51 64 
+ 45 64  387 23 
+  6 98  215 314
+*   +   *   +  
-- 
2.51.2