Quest 1 / Part 2

data/quest-1-part-2.txt

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+ABxDDDACACDADABCCADxABBDBACADDDBCCDBBBDBBABCDCADADBABAAADACAxDACCABBxCxDDCBDBCDBDxBCDBBDBCxCDCDBBBxxBDCABADDAADCBDCDADCDDBDCCxCCADADDADxDDDCDxDACCCCADCCxADBxxDCDDBBBBCABDCCBACCCxDCDACBCDCBAxBBADACDCBDxCABCCDxBxCDCABCBADxCCDDCxCBDABCACBDxDADxAxACBABCCDCxDDBBBABCABCADDCBCDADDBADBBCxBCCDCBBCCAADDCBCDBAAABxBCCCxxDDADCBACACCBBCCCDCBBCDBDACxBDBBxDCCAACDBDACDBBxxBDCxDBCACACDABBBDDDxxBDxDACBAABCBACBDDBBBxDCDBBABDAACCCDDDABAACACxDCBAAABxDBAxBAAABDxADxBABBDADBCADBAACCBBBABxCxDCADDxCADDACDCABBCAADBBDCCACADDBDACACBADABAxCBAAABDBBACBACDCAADDDBDACCBxBxBCDDADCCCADAxBADDxACDDxxxDACxCBAAxCDBDDABCCBDABxABAACBDDCAADDCCAABDBAABxCABDBCCACBBADBDBAAADBDBCBDDBDDxADxDBBxBCBABCACACACABxCBBBBxCAAABCBDDDBBDCCxBCxABCBDCACDAADABDBBABACCDAxAxAACDxCDDAAxAAABCACAABDDCxDBADCCCBACxxxACBBBDACDACDxADAAAAACADDBDADCDCxxCBBAADxCDDDCCCDDxxDACAACDDDCDACxAxDCxCADADCCACDxDBBCACDxDCBCAAxBAABCBBxADDDCADDBADDAACBDCDADBDDCDBADCDBCACCBxBDAAABxCDBDCAAAAxDDCCDDBCCADABAABxCDBDxDCCCCBCCDCBxADABCxACDAxDCDxADBAACxACDxCADxBBBBCDCCABADxBCABBBBxBADADxADDAAAACBADxDBxxACBDxBDAxCCCCACxBDDDCBDxCCACCCAABBBCACxCxDDxDDxADAADBABABAxxCCCAAACCCDABABADCBBxxCBBADABxxCxDDBBxAxCCBAACABxAABxBAAADDxDDBDCDDCBCDCCCxDCCCAxAxACAADDACBBxBBCBxADDBDBAABBDBBDDDCBCCBABAABABDCAxADAxCDBBCADBxBABDDBCBxDDABADDCBDBCBDxBDDBxADDDCxBCDADxxDDDCCCDCBDCDADDDBADCDDCBxDBDxCBxAACBCBDBCDBCDDBCxACDBABAxAABABDADxBACDADBBDACCDADDBBBCCABDCDCDABADAxCDAxBBDCACACDBCCDCDABDAADCCDBCCCDCABABxCCDACBBxCxCDBBCBCDCBDDDADCxBABxCABDxBCxBxACDxAAAAxxABAAxCCAxCBDABxBBxxCCBCCxAACBCACBDxxADABCDCCCCCBBAxCDDDBCDDDCDACADDADBBCBDCAAADDxBCCCDABAxDCBBBCADCDBCBAADBBADBDDCDACCABBxADxDBACACBCCADDCBACCCCBCBBACBDDCAADCCBCBCAACAxBBCBACABABDCAADBxCDBDCADCCDABACDxBADACACxDDDCBCBBDCAxCBACCCBBDCBCDxBDAABDDCDCDBBBBACBCDAxDDAAACABACDACBBCDDDAABxCCBBCABCABCxDACCBBDACDDDxABDBACBDBADDBBBDAxAAABBxCBDBCAxDCBCCABCCBBCDxCCABBCBACABCCxCCCxADBDBDCACBDxBACDADBDCCBDDCCCxCCCCDDDDDBCCDBCBDCxDACAACxADCDDACCDDCBACCDDACACAACCDBABBBCCAAxDADxxACBAABAABCDABAxDCDABCCCCCBDDCxxBCBBxDDADBCCDCACBACDACCADDAxxBCDDDBDCCADxCCAx

src/bin/quest-1-part-2.rs

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+use std::{collections::HashMap, path::PathBuf};
+
+type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>;
+
+fn main() -> Result<()> {
+    let file_path = PathBuf::from("./data/quest-1-part-2.txt");
+    let data = std::fs::read_to_string(file_path)?;
+    let counter = quest_part_2(&data);
+    println!("Quest 1 / Part 2: {counter}");
+    Ok(())
+}
+
+fn quest_part_2(data: &str) -> i32 {
+    let table = HashMap::from([('A', 0), ('B', 1), ('C', 3), ('D', 5)]);
+    let mut counter = 0;
+
+    let mut is_left = false;
+    let mut has_left_contender = false;
+    let mut left_score: i32 = 0;
+    for beast in data.chars() {
+        is_left = !is_left;
+        match (is_left, table.get(&beast)) {
+            (true, None) => {
+                // left has no contender
+                left_score = 0;
+                has_left_contender = false;
+            }
+            (true, Some(score)) => {
+                left_score = *score;
+                has_left_contender = true;
+            }
+            (false, None) => {
+                // right has no container
+                counter += left_score;
+            }
+            (false, Some(score)) if has_left_contender => {
+                // has both left and right contender
+                counter += left_score + score + 2;
+            }
+            (false, Some(score)) => {
+                // has only right contender
+                counter += score;
+            }
+        }
+    }
+    counter
+}
+
+#[cfg(test)]
+mod tests {
+    use super::quest_part_2;
+
+    #[test]
+    fn sample() {
+        let data = "AxBCDDCAxD";
+        let result = quest_part_2(data);
+        assert_ne!(result, 5835);
+        assert_eq!(result, 28);
+    }
+}