Add feature to control if 2024 day 21 cost matrices are computed at c…

…ompile time
ictrobot · Dec 22, 2024 · 3c29cda · 3c29cda
1 parent e5729c4
commit 3c29cda
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Showing 2 changed files with 13 additions and 2 deletions.
diff --git a/crates/year2024/Cargo.toml b/crates/year2024/Cargo.toml
@@ -12,3 +12,4 @@ utils = { path = "../utils" }
 
 [features]
 unsafe = ["utils/unsafe"]
+const_lut = []
diff --git a/crates/year2024/src/day21.rs b/crates/year2024/src/day21.rs
@@ -23,7 +23,9 @@ enum DirectionalKeypad {
     Left = 1, Down = 2, Right = 3,
 }
 
+#[cfg(feature = "const_lut")]
 static PART1_MATRIX: [[u64; 11]; 11] = num_matrix(2);
+#[cfg(feature = "const_lut")]
 static PART2_MATRIX: [[u64; 11]; 11] = num_matrix(25);
 
 impl Day21 {
@@ -37,12 +39,20 @@ impl Day21 {
 
     #[must_use]
     pub fn part1(&self) -> u64 {
-        self.complexity(&PART1_MATRIX)
+        #[cfg(feature = "const_lut")]
+        return self.complexity(&PART1_MATRIX);
+
+        #[cfg(not(feature = "const_lut"))]
+        return self.complexity(&num_matrix(2));
     }
 
     #[must_use]
     pub fn part2(&self) -> u64 {
-        self.complexity(&PART2_MATRIX)
+        #[cfg(feature = "const_lut")]
+        return self.complexity(&PART2_MATRIX);
+
+        #[cfg(not(feature = "const_lut"))]
+        return self.complexity(&num_matrix(25));
     }
 
     fn complexity(&self, matrix: &[[u64; 11]; 11]) -> u64 {
Original file line number	Diff line number	Diff line change
Expand Up		@@ -12,3 +12,4 @@ utils = { path = "../utils" }

		[features]
		unsafe = ["utils/unsafe"]
		const_lut = []