From 86bac31392a76da84817eec020d2b84d099b3cc1 Mon Sep 17 00:00:00 2001
From: mhsn <mail@mhsn.net>
Date: Wed, 18 Mar 2026 21:48:13 +0000
Subject: add other challenges support

---
 aoc/2024/07/rust/Cargo.lock  |  7 +++++
 aoc/2024/07/rust/Cargo.toml  |  6 ++++
 aoc/2024/07/rust/src/main.rs | 71 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 84 insertions(+)
 create mode 100644 aoc/2024/07/rust/Cargo.lock
 create mode 100644 aoc/2024/07/rust/Cargo.toml
 create mode 100644 aoc/2024/07/rust/src/main.rs

(limited to 'aoc/2024/07/rust')

diff --git a/aoc/2024/07/rust/Cargo.lock b/aoc/2024/07/rust/Cargo.lock
new file mode 100644
index 0000000..ac79b17
--- /dev/null
+++ b/aoc/2024/07/rust/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "puzzle"
+version = "0.1.0"
diff --git a/aoc/2024/07/rust/Cargo.toml b/aoc/2024/07/rust/Cargo.toml
new file mode 100644
index 0000000..88e7b42
--- /dev/null
+++ b/aoc/2024/07/rust/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "puzzle"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
diff --git a/aoc/2024/07/rust/src/main.rs b/aoc/2024/07/rust/src/main.rs
new file mode 100644
index 0000000..df586b1
--- /dev/null
+++ b/aoc/2024/07/rust/src/main.rs
@@ -0,0 +1,71 @@
+use std::io;
+
+fn main() -> io::Result<()> {
+    let eqns = io::stdin()
+        .lines()
+        .flatten()
+        .collect::<Vec<_>>()
+        .iter()
+        .map(|line| line.split_once(": ").unwrap())
+        .map(|(ans, nums)| {
+            (
+                ans.parse::<u64>().unwrap(),
+                nums.split_whitespace()
+                    .map(|s| s.parse::<u64>().unwrap())
+                    .collect::<Vec<_>>(),
+            )
+        })
+        .collect::<Vec<_>>();
+
+    let silver: u64 = eqns.iter().map(crate::silver).sum();
+    let gold: u64 = eqns.iter().map(crate::gold).sum();
+
+    println!("silver: {silver}");
+    println!("gold: {gold}");
+
+    return Ok(());
+}
+
+fn concat(x: &u64, y: &u64) -> u64 {
+    x * (10u64.pow(y.ilog10() + 1)) + y
+}
+
+fn calibration(want: u64, x: &u64, y: &u64, rest: &[u64], gold: bool) -> bool {
+    if *x > want {
+        return false;
+    }
+    match rest {
+        [] => want == x + y || want == x * y || (gold && want == concat(x, y)),
+        [z, rest @ ..] => {
+            calibration(want, &(x + y), z, rest, gold)
+                || calibration(want, &(x * y), z, rest, gold)
+                || (gold && calibration(want, &concat(x, y), z, rest, gold))
+        }
+    }
+}
+
+fn silver((want, nums): &(u64, Vec<u64>)) -> u64 {
+    match nums.as_slice() {
+        [x, y, rest @ ..] => {
+            if calibration(*want, x, y, rest, false) {
+                *want
+            } else {
+                0
+            }
+        }
+        _ => 0,
+    }
+}
+
+fn gold((want, nums): &(u64, Vec<u64>)) -> u64 {
+    match nums.as_slice() {
+        [x, y, rest @ ..] => {
+            if calibration(*want, x, y, rest, true) {
+                *want
+            } else {
+                0
+            }
+        }
+        _ => 0,
+    }
+}
-- 
cgit v1.2.3