did day5

day5/Cargo.lock

@@ -0,0 +1,4 @@
+[[package]]
+name = "day5"
+version = "0.1.0"
+

day5/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "day5"
+version = "0.1.0"
+authors = ["attila <daf276@gmx.de>"]
+
+[dependencies]

day5/src/main.rs

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+use std::fs;
+use std::char;
+
+fn main() {
+    let lines = fs::read_to_string("input").expect("Unable to read file");
+
+    //Part 1
+    println!("{}", reduce(lines.clone()));
+
+    //Part 2
+
+    let mut all_lengths: Vec<i32> = Vec::new();
+
+    for i in 0..26 {
+        let big_char = char::from_u32(65+i).unwrap();
+        let little_char = char::from_u32(97+i).unwrap();
+
+        let string = lines.clone().replace(big_char, "").replace(little_char, "");
+
+        all_lengths.push(reduce(string));
+    }
+
+    println!("{}", all_lengths.iter().min().unwrap());
+}
+
+fn reduce(string: String) -> i32 {
+    let mut current_string = string;
+    let mut new_string: Vec<char>;
+    let mut last_string = String::new();
+
+    while last_string != current_string {
+        let all_chars: Vec<char> = current_string.chars().into_iter().collect();
+        let mut count = 0;
+
+        new_string = Vec::new();
+
+        while count < all_chars.len() - 1 {
+            let cur_char_uppercase = all_chars[count].to_uppercase().collect::<Vec<char>>()[0];
+            let cur_char_lowercase = all_chars[count].to_lowercase().collect::<Vec<char>>()[0];
+
+            if all_chars[count] == cur_char_lowercase {
+                if all_chars[count + 1] == cur_char_uppercase{
+                    count += 1;
+                } else {
+                    new_string.push(all_chars[count].clone());
+                }
+            } else {
+                if all_chars[count + 1] == cur_char_lowercase{
+                    count += 1;
+                } else {
+                    new_string.push(all_chars[count].clone());
+                }
+            }
+
+            count += 1;
+        }
+
+        new_string.push(all_chars[all_chars.len() - 1].clone());
+
+        last_string= current_string.clone();
+        current_string = new_string.clone().into_iter().collect();
+    }
+
+    return (current_string.len()-1) as i32
+}