From c5c13916792f02e22881c728144ce1956ee798c5 Mon Sep 17 00:00:00 2001
From: Dimitri Lozeve <dimitri@lozeve.com>
Date: Sun, 23 Feb 2020 14:39:12 +0100
Subject: [PATCH] Use CartesianIndices instead of tuples

---
 src/optim.jl | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/src/optim.jl b/src/optim.jl
index 03cbbeb..0f65f89 100644
--- a/src/optim.jl
+++ b/src/optim.jl
@@ -8,9 +8,7 @@ function neighbourindices(mask::Matrix, idx::Int)::Vector{Int}
     end
 
     m, n = size(mask)
-    j, i = divrem(idx - 1, m)
-    i += 1
-    j += 1
+    i, j = Tuple(CartesianIndices(mask)[idx])
     indices = [(i, j-1), (i, j+1), (i-1, j), (i+1, j)]
     # cells filled with 0 are not part of the garden
     cartesianindices = [