make solution more compact

set1/fixed_xor/src/main.rs

@@ -4,7 +4,6 @@ extern crate env_logger;
 extern crate rustc_serialize;
 
 use rustc_serialize::hex::{FromHex, ToHex};
-use std::cmp::min;
 use std::io::{BufRead, stdin};
 
 struct Pairwise<T: Iterator>(T);
@@ -27,13 +26,7 @@ fn main() {
 
     for (line1, line2) in Pairwise(stdin.lock().lines().filter_map(|x| x.ok())) {
         match (line1.from_hex(), line2.from_hex()) {
-            (Ok(v1), Ok(v2)) => {
-                    let mut out = Vec::with_capacity(min(v1.len(), v2.len()));
-                    for (lhs, rhs) in v1.iter().zip(v2) {
-                        out.push(lhs ^ rhs)
-                    }
-                    println!("{}", out.to_hex())
-                },
+            (Ok(v1), Ok(v2)) => println!("{}", v1.iter().zip(v2).map(|(a, b)| a ^ b).collect::<Vec<u8>>().to_hex()),
             (Err(e), _) => error!("{}", e),
             (_, Err(e)) => error!("{}", e)
         }