day 13

day13/Cargo.lock

@@ -0,0 +1,89 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day13"
+version = "0.1.0"
+dependencies = [
+ "serde",
+ "serde_json",
+]
+
+[[package]]
+name = "itoa"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4217ad341ebadf8d8e724e264f13e593e0648f5b3e94b3896a5df283be015ecc"
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.47"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5ea3d908b0e36316caf9e9e2c4625cdde190a7e6f440d794667ed17a1855e725"
+dependencies = [
+ "unicode-ident",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bbe448f377a7d6961e30f5955f9b8d106c3f5e449d493ee1b125c1d43c2b5179"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "ryu"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4501abdff3ae82a1c1b477a17252eb69cee9e66eb915c1abaa4f44d873df9f09"
+
+[[package]]
+name = "serde"
+version = "1.0.150"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e326c9ec8042f1b5da33252c8a37e9ffbd2c9bef0155215b6e6c80c790e05f91"
+dependencies = [
+ "serde_derive",
+]
+
+[[package]]
+name = "serde_derive"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "42a3df25b0713732468deadad63ab9da1f1fd75a48a15024b50363f128db627e"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "serde_json"
+version = "1.0.89"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "020ff22c755c2ed3f8cf162dbb41a7268d934702f3ed3631656ea597e08fc3db"
+dependencies = [
+ "itoa",
+ "ryu",
+ "serde",
+]
+
+[[package]]
+name = "syn"
+version = "1.0.105"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "60b9b43d45702de4c839cb9b51d9f529c5dd26a4aff255b42b1ebc03e88ee908"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "unicode-ident"
+version = "1.0.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6ceab39d59e4c9499d4e5a8ee0e2735b891bb7308ac83dfb4e80cad195c9f6f3"

day13/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "day13"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"

day13/src/main.rs

@@ -0,0 +1,97 @@
+#![feature(iter_array_chunks)]
+#![feature(is_some_and)]
+use std::cmp::Ordering;
+
+fn main() {
+    let json = std::fs::read_to_string("/dev/stdin").unwrap();
+    let mut p1_tot = 0;
+    let mut p2_tot = 1;
+
+    let starting_packet: serde_json::Value = serde_json::from_str("[[2]]").unwrap();
+    let ending_packet: serde_json::Value = serde_json::from_str("[[6]]").unwrap();
+
+    for (i, [left, right]) in json
+        .lines()
+        .filter(|l| !l.is_empty())
+        .array_chunks()
+        .enumerate()
+    {
+        let left: serde_json::Value = serde_json::from_str(left).unwrap();
+        let right: serde_json::Value = serde_json::from_str(right).unwrap();
+
+        let right_order = serde_cmp(Some(&left), Some(&right)).1;
+        if right_order {
+            p1_tot += i + 1;
+        }
+    }
+
+    let mut all = json
+        .lines()
+        .filter(|l| !l.is_empty())
+        .map(|l| serde_json::from_str::<serde_json::Value>(l).unwrap())
+        .collect::<Vec<_>>();
+
+    all.push(starting_packet.clone());
+    all.push(ending_packet.clone());
+
+    all.sort_by(|a, b| match serde_cmp(Some(a), Some(b)).1 {
+        true => Ordering::Less,
+        false => Ordering::Greater,
+    });
+
+    for (idx, line) in all.iter().enumerate() {
+        if *line == starting_packet || *line == ending_packet {
+            p2_tot *= idx + 1;
+        }
+    }
+
+    println!("P1: {}, P2: {}", p1_tot, p2_tot);
+}
+
+// cmp returns two bools: keep checking?, and current values in right order?
+fn serde_cmp(l: Option<&serde_json::Value>, r: Option<&serde_json::Value>) -> (bool, bool) {
+    if l.is_none() && r.is_none() {
+        panic!("both values are none");
+    }
+
+    match (l, r) {
+        (Some(_), None) => return (false, false),
+        (None, Some(_)) => return (false, true),
+        (None, None) => return (true, false),
+        (_, _) => (),
+    }
+
+    let (l, r) = (l.unwrap(), r.unwrap());
+
+    if l.is_number() && r.is_number() {
+        let (ln, rn) = (l.as_i64().unwrap(), r.as_i64().unwrap());
+
+        match ln.cmp(&rn) {
+            Ordering::Greater => return (false, false),
+            Ordering::Equal => return (true, false),
+            Ordering::Less => return (false, true),
+        }
+    }
+
+    let (fl, fr) = (to_flat_vec(l), to_flat_vec(r));
+    for i in 0..std::cmp::max(fl.len(), fr.len()) {
+        let (more, res) = serde_cmp(fl.get(i).copied(), fr.get(i).copied());
+        if !more {
+            return (more, res);
+        }
+    }
+
+    (true, true)
+}
+
+fn to_flat_vec(val: &serde_json::Value) -> Vec<&serde_json::Value> {
+    if val.is_number() {
+        return vec![val];
+    }
+
+    if val.is_array() {
+        return val.as_array().unwrap().iter().collect::<Vec<_>>();
+    }
+
+    panic!("val is neither array or num")
+}