solutions: 313A

solutions/rust/src/bin/313A.rs

@@ -0,0 +1,24 @@
+use std::io;
+
+fn main() {
+    let mut s = String::new();
+    io::stdin().read_line(&mut s).unwrap();
+
+    let balance = s.trim().parse::<String>().unwrap();
+
+    if balance.len() == 2 {
+        println!("{}", balance);
+        std::process::exit(0);
+    }
+
+    let removed: String = balance
+        .chars()
+        .take(balance.len()-2)
+        .chain(balance.chars().skip(balance.len()-1))
+        .collect();
+
+    let options_str: [&str; 3] = [&balance[0..balance.len()-1], &removed, &balance[0..balance.len()]];
+    let options = options_str.map(|i| i.parse::<i64>().unwrap());
+
+    println!("{}", options.iter().max().unwrap());
+}