day 16 of AOC

.gitignore

@@ -1,2 +1,2 @@
 data.txt
-input
+input*

16/a.py

@@ -0,0 +1,56 @@
+import itertools
+from copy import deepcopy
+
+ranges = { y[0]:[range(int(z[0]), int(z[1])+1) for r in y[1:] if ( z:= r.split('-') )] for x in open('input_ranges').read().splitlines() if ( y:= x.replace(' or ',': ').split(': ') ) }
+tickets = [ [ int(y) for y in x.split(',') ] for x in open('input_tickets').read().splitlines() ]
+
+total_range = []
+for range_ in ranges:
+    [ total_range.append(list(x)) for x in ranges[range_] ]
+total_range = list(itertools.chain.from_iterable(total_range))
+
+error = []
+valid = deepcopy(tickets)
+i = 0
+for ticket in tickets[1:]:
+    i += 1
+    err_buf = len(error)
+    [ error.append(x) for x in ticket if x not in total_range ]
+    if len(error) > err_buf:
+        valid[i] = None
+print(sum(error))
+valid = [x for x in valid if (x != None)]
+final_ranges = []
+for i in range(0,len(valid[0])):
+    col = []
+    for j in range(0,len(valid)):
+        col.append(valid[j][i])
+
+    # print(col[0:4])
+    valid_ranges = []
+    for r in ranges:
+        error = []
+        range_ = ranges[r]
+        [ error.append(x) for x in col if (x not in range_[0] and x not in range_[1]) ]
+        if len(error) == 0:
+            # print("         ",i, error, range_, r)
+            valid_ranges.append(r)
+    final_ranges.append(valid_ranges)
+    # print(col)
+
+
+
+p2 = 1
+for z in range(len(final_ranges)):
+    i_ = 0
+    for x in final_ranges:
+        if len(x) == 1:
+            if x[0].split(' ')[0] == 'departure':
+                p2 *= tickets[0][i_]
+            # print(i_, tickets[0][i_], x)
+            for i in range(len(final_ranges)):
+                if x[0] in final_ranges[i]:
+                    # print(final_ranges[i])
+                    final_ranges[i] = [ k for k in final_ranges[i] if k != x[0] ]
+        i_ += 1
+print(p2)