Day 6

day6/Cargo.toml

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+[package]
+name = "day6"
+version = "0.1.0"
+authors = ["henine <matija@rezar.biz>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day6/src/main.rs

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+use std::collections::HashSet;
+use std::fs::File;
+use std::io::{BufRead, BufReader};
+use std::iter::FromIterator;
+use std::result::Result::{Err, Ok};
+
+fn main() {
+    let file = match File::open("input") {
+        Ok(file) => file,
+        Err(e) => panic!(e)
+    };
+
+    let input_buffer = BufReader::new(&file);
+
+    let mut sum = 0;
+
+    let mut seen_chars = HashSet::from_iter((b'a'..=b'z').map(char::from));
+    // seen_chars.extend();
+    for rline in input_buffer.lines() {
+        let line = rline.unwrap();
+
+        if line.trim() == "" {
+            sum += seen_chars.len();
+            seen_chars = HashSet::from_iter((b'a'..=b'z').map(char::from));
+            continue;
+        }
+
+        let line_chars: HashSet<char> = HashSet::from_iter(line.chars());
+        seen_chars = HashSet::from_iter(seen_chars.intersection(&line_chars).map(|x|*x));
+    }
+
+    sum += seen_chars.len();
+
+    println!("{}", sum);
+}

day6/test

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+abc
+
+a
+b
+c
+
+ab
+ac
+
+a
+a
+a
+a
+
+b