Day 13 - first tries

Cargo.lock

@@ -7,6 +7,7 @@ name = "advent-of-code-2022"
 version = "0.1.0"
 dependencies = [
  "automod",
+ "serde_json",
 ]
 
 [[package]]
@@ -20,6 +21,12 @@ dependencies = [
  "syn",
 ]
 
+[[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"
@@ -38,6 +45,29 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "ryu"
+version = "1.0.11"
+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"
+
+[[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"

Cargo.toml

@@ -7,3 +7,4 @@ edition = "2021"
 
 [dependencies]
 automod = "1.0.4"
+serde_json = "1.0.89"

res/13/input.txt

@@ -0,0 +1,449 @@
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+[[9,7],[7,5,[[],[2,0,9,0,0],9,[8,1,3,10]],2]]
+
+[[],[[5],[1,[1,2,6,10,1]],[]],[[],1,8,[[8,7],[7],[4,4,7],[4,9,8]],[[2,6,4],4]]]
+[[6,[10],1],[[9,8,[]],[1,[7,7,1,1,2]],5,[[5,8,9],[10,6,10,6],0,3,9],[7,2,[1,5]]],[4],[3,[2,[8,6,7,2],7]]]
+
+[[9],[8,[[3,0,1,5,5],9],0,6],[1,[],1],[8,3,6,[[8,9],[10,9,6,8,4],[]]],[[],[3,5,1],2,6]]
+[[4,[]],[5],[[],[]]]
+
+[[5],[[[],[2,2]],4],[5,[[],[9,3,0,1,4],[0,2,1]],[[3],[8,4,10],[]]],[]]
+[[10,[6,10,3,7],[0],3,4]]
+
+[[1,[[5]],[4,1,[]],10,[4,[2,6,5,4,2]]]]
+[[[],5,[],5],[8,3,4,6,7],[1,[]]]

res/13/test_input.txt

@@ -0,0 +1,23 @@
+[1,1,3,1,1]
+[1,1,5,1,1]
+
+[[1],[2,3,4]]
+[[1],4]
+
+[9]
+[[8,7,6]]
+
+[[4,4],4,4]
+[[4,4],4,4,4]
+
+[7,7,7,7]
+[7,7,7]
+
+[]
+[3]
+
+[[[]]]
+[[]]
+
+[1,[2,[3,[4,[5,6,7]]]],8,9]
+[1,[2,[3,[4,[5,6,0]]]],8,9]

src/days/d13.rs

@@ -0,0 +1,122 @@
+use std::fs;
+use serde_json::Value;
+
+pub fn solve() {
+    let path = "res/13/input.txt";
+
+    let contents = fs::read_to_string(path).expect("I/O error, wrong path?");
+
+    let pairs: Vec<(&str, &str)> = contents
+        .split("\n\n")
+        .map(|pair| pair.split_at(pair.find("\n").unwrap()))
+        .collect();
+    
+    let mut right_order_indices = Vec::<u32>::new();
+    pairs.iter().enumerate().for_each(|(i, pair)| {
+        let json1: Value = serde_json::from_str(pair.0).unwrap();
+        let json2: Value = serde_json::from_str(pair.1).unwrap();
+
+        println!("== Pair {} ==", i+1);
+        let res = is_right_order((&json1, &json2));
+
+        println!("Pair {}: {res:?}\n", i+1);
+
+        if res != Ordered::No {
+            right_order_indices.push((i+1) as u32);
+        }
+    });
+
+    let res: u32 = right_order_indices.iter().sum();
+    println!("Result 1: {res}");
+
+    
+}
+
+#[derive(PartialEq, Debug)]
+enum Ordered {
+    Yes,
+    Maybe,
+    No
+}
+
+fn is_right_order(values: (&Value, &Value)) -> Ordered {
+    println!("Compare {} vs {}", values.0, values.1);
+    
+    // both values numbers
+    if values.0.is_number() && values.1.is_number() {
+        let v0 = values.0.as_u64().unwrap();
+        let v1 = values.1.as_u64().unwrap();
+        // wrong order if right is higher than left
+        if v0 < v1 {
+            return Ordered::Yes
+        } else if v0 == v1 {
+            return Ordered::Maybe
+        } else {
+            return Ordered::No
+        }
+    } 
+    // left number, right array
+    else if values.0.is_number() && values.1.is_array() {
+        // wrap number into arr, then compare again
+        let left = Value::Array(vec!(values.0.clone()));
+        return is_right_order((&left, &values.1));
+    }
+    // left array, right number
+    else if values.0.is_array() && values.1.is_number() {
+        // wrap number into arr, then compare again
+        let right = Value::Array(vec!(values.1.clone()));
+        return is_right_order((&values.0, &right));
+    }
+    // both array
+    else if values.0.is_array() && values.1.is_array() {
+        let a0 = values.0.as_array().unwrap();
+        let a1 = values.1.as_array().unwrap();
+
+        let mut a0iter = a0.iter();
+        let mut a1iter = a1.iter();
+
+        loop {
+            let left = a0iter.next();
+            let right = a1iter.next();
+
+            if left.is_none() && right.is_some() {
+                return Ordered::Yes
+            }
+
+            if left.is_some() && right.is_none() {
+                return Ordered::No
+            }
+
+            if left.is_none() && right.is_none() {
+                return Ordered::Maybe
+            }
+
+            let left = left.unwrap();
+            let right = right.unwrap();
+
+            return is_right_order((&left, &right));
+        }
+
+        let mut current_order = Ordered::Maybe;
+        a0.iter()
+            .enumerate()
+            .for_each(|(i, _)| {
+                if current_order == Ordered::No 
+                    || current_order == Ordered::Yes {
+                    return
+                }
+                if a1.len() < i+1 {
+                    current_order = Ordered::No;
+                    println!("2nd arr too short");
+                    return
+                }
+                current_order = is_right_order((&a0[i], &a1[i]));
+        });
+        if a0.len() > a1.len() && current_order != Ordered::No {
+            return Ordered::Yes
+        }
+        return current_order;
+    }
+
+    Ordered::Yes
+}

src/main.rs

@@ -1,7 +1,7 @@
 pub mod days;
 
 fn main() {
-    days::d12::solve()
+    days::d13::solve()
     //_all_days()
 }
 
@@ -30,4 +30,6 @@ fn _all_days() {
     days::d11::solve();
     println!("\nDay 12");
     days::d12::solve();
+    println!("\nDay 13");
+    days::d13::solve();
 }