day12

2020-12-12 06:34:48 +01:00 · 2020-12-12 06:34:48 +01:00 · 1f61c4b97d
commit 1f61c4b97d
parent ef7fb6e53e
3 changed files with 867 additions and 0 deletions
--- a/day12.py
+++ b/day12.py
@ -0,0 +1,79 @@
+import aoclib
+
+DAY = 12
+TEST_SOLUTION_PART1 = 25
+TEST_SOLUTION_PART2 = 286
+FACING = ['N', 'E', 'S', 'W']
+
+
+def move(instruction, x, y, j):
+    where = instruction[0]
+    dist = int(instruction[1:])
+
+    if where == 'F':
+        where = FACING[j]
+
+    if where == 'N':
+        y -= dist
+    elif where == 'S':
+        y += dist
+    elif where == 'E':
+        x += dist
+    elif where == 'W':
+        x -= dist
+    elif where == 'R':
+        j = (j + int(dist / 90)) % 4
+    elif where == 'L':
+        j = (j - int(dist / 90)) % 4
+
+    return x, y, j
+
+
+def part1(test_mode=False):
+    my_input = aoclib.getInputAsArray(day=DAY, test=test_mode)
+
+    posX = 0
+    posY = 0
+    face = 1
+    for direction in my_input:
+        posX, posY, face = move(direction, posX, posY, face)
+
+    return abs(posX) + abs(posY)
+
+
+def moveWaypoint(inst, sx, sy, wx, wy):
+    where = inst[0]
+    dist = int(inst[1:])
+
+    if where == 'F':
+        sx += wx * dist
+        sy += wy * dist
+
+    if where == 'N':
+        wy -= dist
+    elif where == 'S':
+        wy += dist
+    elif where == 'E':
+        wx += dist
+    elif where == 'W':
+        wx -= dist
+    elif where == 'R':
+        for i in range(int(dist / 90)):
+            wx, wy = -wy, wx
+    elif where == 'L':
+        for i in range(int(dist / 90)):
+            wx, wy = wy, -wx
+
+    return sx, sy, wx, wy
+
+
+def part2(test_mode=False):
+    my_input = aoclib.getInputAsArray(day=DAY, test=test_mode)
+    posShipX = 0
+    posShipY = 0
+    posWaypointX = 10
+    posWaypointY = -1
+    for direction in my_input:
+        posShipX, posShipY, posWaypointX, posWaypointY = moveWaypoint(direction, posShipX, posShipY, posWaypointX, posWaypointY)
+
+    return abs(posShipX) + abs(posShipY)
--- a/inputs/12
+++ b/inputs/12
@ -0,0 +1,783 @@
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--- a/inputs/12_test
+++ b/inputs/12_test
@ -0,0 +1,5 @@
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