day10: part2

day10/Cargo.toml

@@ -8,6 +8,7 @@ edition = "2018"
 
 [features]
 
+part2=[]
 test = []
 
 [dependencies]

day10/Makefile

@@ -0,0 +1,27 @@
+CARGO_FEATURE_FLAGS?=
+
+RUSTFLAGS?=-C target-cpu=native
+
+.PHONY: all
+.NOTPARALLEL: all
+all:
+	$(MAKE) part1
+	$(MAKE) part2
+
+.NOTPARALLEL: part1
+part1: $(wildcard src/*.rs)
+	RUSTFLAGS="$(RUSTFLAGS)" cargo build --release $(addprefix --features ,$(CARGO_FEATURE_FLAGS))
+	mv -f target/release/day10 $@
+	strip $@
+	
+.NOTPARALLEL: part2
+part2: $(wildcard src/*.rs)
+	RUSTFLAGS="$(RUSTFLAGS)" cargo build --release --features $@ $(addprefix --features ,$(CARGO_FEATURE_FLAGS))
+	mv -f target/release/day10 $@
+	strip $@
+	
+clean:
+	rm -f part{1,2}
+
+full-clean: clean
+	rm -rf target

day10/src/main.rs

@@ -86,12 +86,12 @@ fn iterate_adaptor_chain(map: &Adaptors, mut diffs: Option<&mut Diffs>, finding:
     }
 }
 
+#[cfg(feature="part2")] 
 mod part2;
 
-
 fn main() -> Result<(), Box<dyn std::error::Error>>
 {
-    
+    #![allow(unused_variables)]
     let (all_jolts, output_rat) = {
 	let mut map: Adaptors = conv_input(get_input()).collect();
 	let orat = map.iter().map(|&(x, _)| x).max().unwrap().get() + 3; // rating of output device
@@ -101,16 +101,20 @@ fn main() -> Result<(), Box<dyn std::error::Error>>
 	(map, orat)
     };
     debug_assert_eq!(all_jolts.num_pages(), 1); // Assert we have space efficiency.
-    
-    let diffs: Diffs = std::iter::successors(Some((0, Diffs::default())), |&(next, _)| {
-	if let (Some(next), d) = find_smallest(&all_jolts, next) {
-	    Some((next, d))
-	} else {
-	    None
-	}
-    }).map(|(_, d)| d).sum();
-    
-    println!("{}", diffs.jd1() * diffs.jd3());
+
+    #[cfg(not(feature="part2"))] 
+    {
+	let diffs: Diffs = std::iter::successors(Some((0, Diffs::default())), |&(next, _)| {
+	    if let (Some(next), d) = find_smallest(&all_jolts, next) {
+		Some((next, d))
+	    } else {
+		None
+	    }
+	}).map(|(_, d)| d).sum();
+	
+	println!("{}", diffs.jd1() * diffs.jd3());
+    }
+    #[cfg(feature="part2")] 
     println!("{}", {
 	//let start = all_jolts.iter().map(|&(k, _)| u8::from(k)).min().unwrap();
 	part2::solve(all_jolts, output_rat)