🪱

y2022/p09.py

+def move(diff):
+    dt = 0
+    if max(abs(diff.real), abs(diff.imag)) > 1:
+        dt += diff.real and diff.real / abs(diff.real)
+        dt += diff.imag and (diff.imag / abs(diff.imag)) * 1j
+    return dt
+
+
+moves = dict(zip('LRUD', [-1, 1, -1j, 1j]))
+state = {i: 0 for i in range(10)}
+history = {i: set() for i in state}
+for instruction in open(0).read().splitlines():
+    k, v = instruction.split()
+    for step in k * int(v):
+        for i in state:
+            state[i] += move(state[i - 1] - state[i]) if i else moves[k]
+            history[i].add(state[i])
+
+print(len(history[0]))
+print(len(history[9]))