finally restored git access so adding 2024, days 01-15

1 files changed, 41 insertions, 0 deletions

diff --git a/2024/aoc2024-d08.py b/2024/aoc2024-d08.py
new file mode 100644
index 0000000..b977a26
--- /dev/null
+++ b/2024/aoc2024-d08.py
@@ -0,0 +1,41 @@
+#advent of code 2024
+#day 08
+#cool
+xMin, yMin, xMax, yMax = 0,0,0,0; #map bounds
+antennas = {}; #dictionary of antennas
+antinodes1 = set(); #antinodes for part 1
+antinodes2 = set(); #anitnodes for part 2
+
+f = open("08.in","r");
+for y,l in enumerate(f):
+	yMax = max(yMax,y);
+	for x, c in enumerate(l[:-1]):
+		xMax = max(xMax,x);
+		if c != ".":
+			if antennas.get(c,None) == None:
+				antennas[c] = [];
+			antennas[c].append((x,y));
+f.close();
+
+for antenna in antennas: #for each antenna
+	for a1 in antennas[antenna]: #for each instance of that antenna
+		for a2 in antennas[antenna]: #for each counterpart of that instance
+			if a1 == a2: continue; #antenna can't have the antinode on its own
+			a1x, a1y = a1;
+			a2x, a2y = a2;
+			dx = a2x-a1x;
+			dy = a2y-a1y;
+			if (xMin <= a1x-dx <= xMax) and (yMin <= a1y-dy <= yMax):
+				antinodes1.add((a1x-dx,a1y-dy)); 
+			antinodes2.add((a1x,a1y)); 
+			while True:
+				ax = a1x-dx;
+				ay = a1y-dy;
+				if not ((xMin <= ax <= xMax) and (yMin <= ay <= yMax)):
+					break;
+				antinodes2.add((ax,ay)); 
+				a1x = ax;
+				a1y = ay;		
+
+print("part 1 =", len(antinodes1));
+print("part 2 =", len(antinodes2));