Solutions for day14, day18, day19

2026-10-27 23:32:30 +00:00 · 2016-12-20 09:24:03 -05:00
1 parent 4cdfe2fd7a
commit 3e793911dc
@@ -0,0 +1,144 @@
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@@ -0,0 +1,8 @@
+[package]
+name = "day14"
+version = "0.1.0"
+authors = ["~krowbar"]
+
+[dependencies]
+rust-crypto = "^0.2"
+regex = "0.1"
@@ -0,0 +1,124 @@
+extern crate crypto;
+//extern crate regex;
+
+use crypto::md5::Md5;
+use crypto::digest::Digest;
+//use regex::Regex;
+
+#[derive(Debug)]
+struct Key {
+    idx: u64,
+    letters: Vec<char>,
+    is_valid: bool,
+    hash: String,
+}
+
+fn repeat_letters(line: &String, size: u64, only_first: bool) -> Vec<char> {
+    let mut result: Vec<char> = vec![];
+    let mut count = 1; //we always have 1-in-a-row
+    let bytes = line.as_bytes();
+
+    'outer: for idx in 0..line.len() - 2 {
+        if bytes[idx] == bytes[idx + 1] {
+            count = count + 1;
+            if count == size && result.iter().position(|&c| c == (bytes[idx] as char)) == None {
+                result.push(bytes[idx] as char);
+                if only_first {
+                    break 'outer;
+                }
+            }
+        } else {
+            count = 1;
+        }
+    }
+    result
+}
+
+fn purge_keys(keys: Vec<Key>, idx: u64, threshold: u64) -> Vec<Key> {
+    //remove all invalid keys with idx lower than threshold
+    //println!("Purging keys older than {} - {}", idx,  threshold);
+    let old_len = keys.len();
+    let new_keys: Vec<Key> =
+        keys.into_iter()
+        .filter(|key| key.is_valid || key.idx + threshold > idx)
+        .collect::<Vec<_>>();
+    if old_len > new_keys.len() {
+        //println!("Purged {} old keys with an idx < {}", old_len - new_keys.len(), idx - threshold);
+    }
+    new_keys
+}
+
+fn validate_keys(keys: &mut Vec<Key>, key_char: char, idx: u64, threshold: u64) {
+    //  will validate any unvalidated keys within the last *1000* that share the repeated char
+    let mut count = 0;
+    keys.into_iter()
+        .map(|key| {
+            if !key.is_valid && key.idx + threshold > idx && key.letters.iter().position(|&c| c == key_char) != None {
+                key.is_valid = true;
+                count = count + 1;
+            }
+            key
+        })
+        .collect::<Vec<_>>();
+    if count > 0 {
+        //println!("On key {} at {} keys, validated {} keys using '{}'", idx, keys.len(), count, key_char);
+    }
+}
+
+fn we_are_done(keys: &Vec<Key>, pad_size: usize) -> bool {
+    //we are done when we have 'pad_size' valid keys in a row
+    keys.iter().take_while(|key| key.is_valid ).collect::<Vec<_>>().len() >= pad_size
+}
+
+const PAD_SIZE: usize = 64;
+const THRESHOLD: u64 = 1000;
+
+fn main() {
+
+    println!("I did something wrong on this one and am not getting the correct answer. :(");
+
+    let mut keys: Vec<Key> = vec![];
+    let mut hasher = Md5::new();
+
+    let salt = "ahsbgdzn";
+
+    //let values: Vec<u64> = vec![18, 39, 816];
+    for idx in 0..std::u64::MAX {
+        hasher.input(format!("{}{}", salt, idx).as_bytes());
+        //print!("{}{} -> ", salt, idx);
+
+        let mut output = [0; 16]; //represents MD5 string
+        hasher.result(&mut output);
+        let output_str: String = output.iter().map(|&c| format!("{:x}", c)).collect();
+        //println!("{}", output_str);
+
+        for r in repeat_letters(&output_str, 5, false) {
+            //println!("Found a super key for '{}'", r);
+            keys = purge_keys(keys, idx, THRESHOLD);
+            validate_keys(&mut keys, r, idx, THRESHOLD);
+            //println!("  from {}", output_str);
+        }
+
+        //println!("{} - {} - {:?}", idx, output_str, repeat_letters(&output_str, 3));
+        let threepeats = repeat_letters(&output_str, 3, true);
+        if threepeats.len() > 0 {
+            //ONLY CONSIDER FIRST TRIPPLET
+            let new_key = Key { idx: idx, letters: threepeats, is_valid: false, hash: String::from(output_str) };
+            //println!("Added {:?}", new_key);
+            keys.push(new_key);
+        }
+
+        if we_are_done(&keys, PAD_SIZE) {
+            if keys.len() >= PAD_SIZE {
+                println!("We're done! Finished on idx {}", idx);
+                println!("The {}th key is {:?}", PAD_SIZE, keys.iter().nth(PAD_SIZE).unwrap());
+                //println!("The {}th key is {:?}", pad_size, keys[pad_size]);
+            } else {
+                println!("Uh oh! We didn't find enough keys. :(");
+            }
+            break;
+        }
+
+        hasher.reset();
+    }
+}