unwash day06 or something

src/day06.zig

@@ -20,48 +20,41 @@ const Race = struct {
 };
 
 fn solve(alloc: mem.Allocator, input: []const u8) !Solution {
-    const races: []Race = r: {
+    var result: usize = 1;
+    {
         var it = util.splitLines(input);
         const times = try util.parseIntsScalar(usize, alloc, it.next().?[10..], .{});
         const distances = try util.parseIntsScalar(usize, alloc, it.next().?[10..], .{});
         defer alloc.free(times);
         defer alloc.free(distances);
-        var al = try std.ArrayList(Race).initCapacity(alloc, times.len);
-        for (times, distances) |t, d| {
-            try al.append(.{ .time = t, .distance = d });
-        }
-        break :r try al.toOwnedSlice();
-    };
-    defer alloc.free(races);
 
-    const bigRace: Race = r: {
-        var it = util.splitLines(input);
-        var vals: [2]usize = undefined;
-        for (0..vals.len) |i| {
-            const line = try mem.replaceOwned(u8, alloc, it.next().?[10..], " ", "");
-            defer alloc.free(line);
-            vals[i] = try std.fmt.parseInt(usize, line, 10);
-        }
-        break :r .{ .time = vals[0], .distance = vals[1] };
-    };
-
-    var result: usize = 1;
-    for (races) |race| {
+        for (times, distances) |time, minDistance| {
             var winning: usize = 0;
-        for (0..race.time - 1) |speed| {
-            const distance = speed * (race.time - speed);
-            if (distance > race.distance) winning += 1;
+            for (0..time - 1) |speed| {
+                const distance = speed * (time - speed);
+                if (distance > minDistance) winning += 1;
             }
             result *= winning;
         }
+    }
 
     var result2: usize = 1;
+    {
+        var it = util.splitLines(input);
+        var td: [2]usize = undefined;
+        for (0..td.len) |i| {
+            const line = try mem.replaceOwned(u8, alloc, it.next().?[10..], " ", "");
+            defer alloc.free(line);
+            td[i] = try std.fmt.parseInt(usize, line, 10);
+        }
+
         var winning2: usize = 0;
-    for (0..bigRace.time - 1) |speed| {
-        const distance = speed * (bigRace.time - speed);
-        if (distance > bigRace.distance) winning2 += 1;
+        for (0..td[0] - 1) |speed| {
+            const distance = speed * (td[0] - speed);
+            if (distance > td[1]) winning2 += 1;
         }
         result2 *= winning2;
+    }
 
     return .{ .a = result, .b = result2 };
 }
@@ -81,5 +74,5 @@ test "gold" {
         \\Distance:  9  40  200
     ;
     const sln = try solve(std.testing.allocator, input);
-    try std.testing.expectEqual(@as(usize, 288), sln.b);
+    try std.testing.expectEqual(@as(usize, 71503), sln.b);
 }