Add day 5 solutions

1 files changed, 25 insertions, 0 deletions

diff --git a/2021/05/puzzles.awk b/2021/05/puzzles.awk
new file mode 100644
index 0000000..976b6aa
--- /dev/null
+++ b/2021/05/puzzles.awk
@@ -0,0 +1,25 @@
+#!/usr/bin/env -S awk -f
+
+BEGIN { FS = ",| -> " }
+
+$1 == $3 && $2 <= $4 { for (i = $2; i <= $4; i++) grid[i][$1]++; next }
+$1 == $3             { for (i = $4; i <= $2; i++) grid[i][$1]++; next }
+$2 == $4 && $1 <= $3 { for (i = $1; i <= $3; i++) grid[$2][i]++; next }
+$2 == $4             { for (i = $3; i <= $1; i++) grid[$2][i]++; next }
+
+# START PART 2
+$1 <= $3 && $2 <= $4 { while (!($1 > $3)) { grid[$2][$1]++; $1++; $2++ } next }
+$1 <= $3             { while (!($1 > $3)) { grid[$2][$1]++; $1++; $2-- } next }
+$2 <= $4             { while (!($1 < $3)) { grid[$2][$1]++; $1--; $2++ } next }
+                     { while (!($1 < $3)) { grid[$2][$1]++; $1--; $2-- } next }
+# END PART 2
+
+END {
+	for (i = 0; i < 1000; i++) {
+		for (j = 0; j < 1000; j++) {
+			if (grid[i][j] > 1)
+				acc++
+		}
+	}
+	print acc
+}