Switch to nightly and use BTreeSet instead!

rust-toolchain

@@ -0,0 +1 @@
+nightly

src/bin/p01.rs

@@ -1,4 +1,4 @@
-use std::collections::BinaryHeap;
+use std::collections::BTreeSet;
 use std::fs;
 use std::io::{self, BufRead};
 
@@ -7,7 +7,7 @@ fn main() {
     let file = fs::File::open(filename).expect("Can't open file");
     let lines = io::BufReader::new(file).lines();
 
-    let mut heap = BinaryHeap::new();
+    let mut set = BTreeSet::new();
     let mut cur_cals: u32 = 0;
     for l in lines {
         match l.expect("Can't read line.").parse::<u32>() {
@@ -15,11 +15,11 @@ fn main() {
                 cur_cals += cals;
             }
             _ => {
-                heap.push(cur_cals);
+                set.insert(cur_cals);
                 println!(
                     "new cals: {}, max so far: {}",
                     cur_cals,
-                    heap.peek().unwrap()
+                    set.last().unwrap()
                 );
                 cur_cals = 0;
             }
@@ -27,12 +27,9 @@ fn main() {
     }
 
     if cur_cals > 0 {
-        heap.push(cur_cals);
+        set.insert(cur_cals);
     }
 
-    let mut vec = heap.into_sorted_vec();
-    vec.dedup();
-
-    let total: u32 = vec.iter().rev().take(3).sum();
+    let total: u32 = set.iter().rev().take(3).sum();
     println!("calories of top 3 are: {}", total);
 }