From 0f7b5ffbb27270c628609884cb6b932f025f973d Mon Sep 17 00:00:00 2001
From: Martin Ashby <martin@ashbysoft.com>
Date: Mon, 18 Dec 2023 08:13:24 +0000
Subject: day 11 pt2

---
 day11.zig | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

(limited to 'day11.zig')

diff --git a/day11.zig b/day11.zig
index bcb5c2a..190c860 100644
--- a/day11.zig
+++ b/day11.zig
@@ -2,6 +2,7 @@ const std = @import("std");
 
 pub fn main() !void {
     try std.fmt.format(std.io.getStdOut().writer(), "day 11 pt1: {}\n", .{try solve_pt1(std.heap.page_allocator, puzzle_input)});
+    try std.fmt.format(std.io.getStdOut().writer(), "day 11 pt2: {}\n", .{try solve_pt2(std.heap.page_allocator, puzzle_input)});
 }
 
 const Coord = struct {
@@ -14,6 +15,12 @@ inline fn get(grid: []const u8, width: usize, x: usize, y: usize) u8 {
 }
 
 fn solve_pt1(a: std.mem.Allocator, input: []const u8) !u64 {
+    return solve(a, input, 2);
+}
+fn solve_pt2(a: std.mem.Allocator, input: []const u8) !u64 {
+    return solve(a, input, 1000000);
+}
+fn solve(a: std.mem.Allocator, input: []const u8, multiplier: usize) !u64 {
     const width: usize = std.mem.indexOfScalar(u8, input, '\n') orelse return error.BadInput;
     const height: usize = (input.len / width + 1) - 1;
     // std.log.warn("width {} height {}", .{width, height});
@@ -34,7 +41,7 @@ fn solve_pt1(a: std.mem.Allocator, input: []const u8) !u64 {
             }
         }
         if (allspace) {
-            x_adj += 1;
+            x_adj += (multiplier-1);
         }
         x_adjust[x] = x_adj;
     }
@@ -48,7 +55,7 @@ fn solve_pt1(a: std.mem.Allocator, input: []const u8) !u64 {
             }
         }
         if (allspace) {
-            y_adj += 1;
+            y_adj += (multiplier-1);
         }
         y_adjust[y] = y_adj;
     }
@@ -79,6 +86,12 @@ fn solve_pt1(a: std.mem.Allocator, input: []const u8) !u64 {
 test "pt1" {
     try std.testing.expectEqual(@as(u64, 374), try solve_pt1(std.testing.allocator, test_input));
 }
+test "pt2" {
+    try std.testing.expectEqual(@as(u64, 1030), try solve(std.testing.allocator, test_input, 10));
+}
+test "pt2_2" {
+    try std.testing.expectEqual(@as(u64, 8410), try solve(std.testing.allocator, test_input, 100));
+}
 
 const test_input = 
 \\...#......
-- 
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