Solution for Moons and Umbrellas

0327-Qualification/task2-moons-umbrellas/Cargo.toml

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+[package]
+name = "task2-moons-umbrellas"
+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]

0327-Qualification/task2-moons-umbrellas/src/main.rs

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+use std::{io::{self, BufRead}};
+
+const CHAR_C: char = 'C';
+const CHAR_J: char = 'J';
+
+fn solve(cj_price: u32, jc_price: u32, template: &str) -> u32 {
+    let chars: Vec<_> = template.chars().filter(|&ch| ch == CHAR_C || ch == CHAR_J).collect();
+
+    let mut result = 0;
+    for i in 1..chars.len() {
+        result += match (chars[i-1], chars[i]) {
+            (CHAR_C, CHAR_J) => cj_price,
+            (CHAR_J, CHAR_C) => jc_price,
+            _ => 0,
+        };
+    }
+
+    result
+}
+
+fn main() {
+    let stdin = io::stdin();
+    let mut lines = stdin.lock().lines();
+
+    let test_number: u32 = lines.next().unwrap().unwrap().parse().unwrap();
+    for t in 1..=test_number {
+        let line = lines.next().unwrap().unwrap();
+        let parts: Vec<_> = line.split(char::is_whitespace).collect();
+        println!("Case #{}: {}", t, solve(parts[0].parse().unwrap(), parts[1].parse().unwrap(), parts[2]));
+    }
+}