add 12th day

12/1.py

@@ -0,0 +1,32 @@
+with open("input") as f:
+    content = [x.strip() for x in f]
+
+east = 90
+south = 180
+west = 270
+north = 0
+ns = 0
+ew = 0
+orientation = east
+for ins in content:
+    cmd = ins[0]
+    number = int(ins[1:])
+
+    if cmd == "N" or (cmd == "F" and orientation == north):
+        ns += number
+    if cmd == "S" or (cmd == "F" and orientation == south):
+        ns -= number
+    if cmd == "E" or (cmd == "F" and orientation == east):
+        ew += number
+    if cmd == "W" or (cmd == "F" and orientation == west):
+        ew -= number
+    if cmd == "L":
+        orientation -= number
+    if cmd == "R":
+        orientation += number
+    while orientation >= 360:
+        orientation -= 360
+    while orientation < 0:
+        orientation += 360
+
+print(abs(ew) + abs(ns))

12/2.py

@@ -0,0 +1,39 @@
+with open("input") as f:
+    content = [x.strip() for x in f]
+
+cos = {90: 0, 180: -1, 270: -0}
+sin = {90: 1, 180: 0, 270: -1}
+wns = 1
+wew = 10
+ns = 0
+ew = 0
+
+for ins in content:
+    rotation = 0
+    cmd = ins[0]
+    number = int(ins[1:])
+
+    if cmd == "N":
+        wns += number
+    if cmd == "S":
+        wns -= number
+    if cmd == "E":
+        wew += number
+    if cmd == "W":
+        wew -= number
+    # x' = x * cosx + y * sinx
+    # y' = -x * sinx + y * cosx
+    if cmd == "L":
+        rotation = 360 - number
+    if cmd == "R":
+        rotation = number
+    if cmd == "F":
+        ns += (wns*number)
+        ew += (wew*number)
+    if rotation:
+        newew = (wew * cos[rotation]) + (wns * sin[rotation])
+        newns = (-wew * sin[rotation]) + (wns * cos[rotation])
+        wew = newew
+        wns = newns
+
+print(abs(ew) + abs(ns))

12/einput

@@ -0,0 +1,5 @@
+F10
+N3
+F7
+R90
+F11

12/input

@@ -0,0 +1,796 @@
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