add day 12 part 1

day12/Cargo.lock

@@ -0,0 +1,145 @@
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day12/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "day12"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+regex = "1.12.4"
+serde = "1.0.228"
+serde_json = "1.0.150"

day12/input.json

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truncated

day12/src/main.rs

@@ -0,0 +1,24 @@
+use regex::Regex;
+use serde_json::Value;
+
+fn main() {
+    let content = std::fs::read_to_string("input.json").unwrap();
+
+    part1(&content);
+    part2(&content);
+}
+
+fn part2(content: &str) {
+    let json: Value = serde_json::from_str(content).unwrap();
+
+    // dbg!(json.as_object().unwrap().iter().next().unwrap());
+}
+
+fn part1(content: &str) {
+    let re = Regex::new("-?[0-9]+").unwrap();
+    let count: isize = re
+        .find_iter(content)
+        .map(|s| s.as_str().parse::<isize>().unwrap())
+        .sum();
+    println!("{count}");
+}