Solution for day 6

day06/Cargo.toml

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+[package]
+name = "day06"
+version = "0.1.0"
+authors = ["inga-lovinde <52715130+inga-lovinde@users.noreply.github.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day06/src/main.rs

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+use std::collections::HashMap;
+use std::io::{self, BufRead};
+
+fn main() {
+    let stdin = io::stdin();
+    let mut answers = HashMap::new();
+    let mut result_anybody = 0;
+    let mut result_everybody = 0;
+    let mut group_size = 0;
+    for line_result in stdin.lock().lines() {
+        let line = line_result.unwrap();
+        if line == "" {
+            let group_anybody = answers.len();
+            let group_everybody = answers.values().filter(|&&count| count == group_size).count();
+            result_anybody += group_anybody;
+            result_everybody += group_everybody;
+            println!("Group: {}/{}, total: {}/{}", group_everybody, group_anybody, result_everybody, result_anybody);
+            answers.clear();
+            group_size = 0;
+        } else {
+            group_size += 1;
+            for ch in line.chars() {
+                let count = answers.entry(ch).or_insert(0);
+                *count += 1;
+            }
+        }
+    }
+}