add solution 3, parts 1 and 2

2020/3/input

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2020/3/sample_input

@@ -0,0 +1,11 @@
+..##.......
+#...#...#..
+.#....#..#.
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+..#.##.....
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2020/3/solution.py

@@ -0,0 +1,40 @@
+#!/usr/bin/python
+
+fd = open("input", "r")
+buf = []
+lines = fd.readlines()
+lenlines = len(lines)
+
+for i in lines:
+    buf.append(i)
+
+def counter(l, c):
+    cnt = 0
+    for i in l:
+        if i == c: cnt += 1
+    return cnt
+
+def listmapper(l, x, y):
+    hlen = len(l[0]) - 1
+    return l[y][x % hlen]
+    print(x % hlen)
+
+def getTrees(x, y):
+    try:
+        pos = (0, 0)
+        cnt = 0
+        while True:
+            pos = (pos[0] + x, pos[1] + y)
+            if listmapper(buf, pos[0], pos[1]) == '#': cnt += 1
+    except IndexError:
+        pass
+    return cnt
+
+print(getTrees(3, 1))
+print("--")
+
+cnt = 1
+for i in [[1, 1], [3, 1], [5, 1], [7, 1], [1, 2]]:
+    trees = getTrees(i[0], i[1])
+    cnt *= trees
+    print("{}, {} -- {} ({})".format(i[0], i[1], trees, cnt))