1 files changed, 29 insertions, 0 deletions
diff --git a/2020/aoc2020-d03.py b/2020/aoc2020-d03.py
new file mode 100644
index 0000000..aa485e0
--- /dev/null
+++ b/2020/aoc2020-d03.py
@@ -0,0 +1,29 @@
+#advent of code 2020
+#day 03
+
+grid = dict();
+limY = 0;
+limX = 0;
+PuzzleInput = open("03.in","r");
+for y,line in enumerate(PuzzleInput):
+	for x, c in enumerate(line):
+		grid[(x,y)] = c;
+		limX = max(limX,x);
+	limY = max(limY,y);
+PuzzleInput.close();
+slopes = [(1,1),(3,1),(5,1),(7,1),(1,2)];
+p1 = 0;
+p2 = 1;
+for slope in slopes:
+	stepX, stepY = slope;
+	MyPosX = 0;
+	MyPosY = 0;	
+	trees = 0;
+	while MyPosY < limY :
+		MyPosX += stepX;
+		MyPosY += stepY;
+		if grid[(MyPosX%limX),MyPosY] == "#": trees +=1;
+	p2 *= trees;
+	if slope == (3,1): p1 += trees;
+print("part 1 = ",p1);
+print("part 2 = ",p2);