From 38b3d0d7f8c7235b5397a870fd50c16ff91525aa Mon Sep 17 00:00:00 2001
From: Robby Zambito <contact@robbyzambito.me>
Date: Wed, 14 May 2025 10:21:23 -0400
Subject: Massive speedup with inlining loop

---
 src/main.zig | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/src/main.zig b/src/main.zig
index 0e09d81..2534c17 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -26,12 +26,10 @@ const SudokuSolver = struct {
 
     fn possibleMovesForCell(self: SudokuSolver, row: usize, col: usize) std.StaticBitSet(9) {
         var cell_guesses: std.StaticBitSet(9) = .initEmpty();
-        for (1..10) |n| {
+        const constraints = join(self.rows[row], join(self.cols[col], self.boxes[boxOf(row, col)]));
+        inline for (1..10) |n| {
             // A number is a possible move iff it does not already exist in the current row, col, or box.
-            if (countEql(
-                join(self.rows[row], join(self.cols[col], self.boxes[boxOf(row, col)])),
-                @intCast(n),
-            ) == 0) {
+            if (countEql(constraints, @intCast(n)) == 0) {
                 cell_guesses.set(n - 1);
             }
         }
-- 
cgit