2024 - Day 8 part 1

2024/8/8.py

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+#!/usr/bin/env python
+# 2024 - Advent Of Code 8
+
+# file = 'input_example.txt'
+file = 'input.txt'
+
+# pylint: disable=consider-using-with
+input_lines = [line.strip('\n') for line in open(file, encoding="utf-8")]
+
+MAX_X = len(input_lines[0])
+MAX_Y = len(input_lines)
+
+def find_antinode(s, dest):
+    print(f'from {s} considering {dest}')
+    res = []
+    diff_x = dest[0] - s[0]
+    diff_y = dest[1] - s[1]
+    # print(f'{diff_x}, {diff_y}')
+
+    p1 = (dest[0] + diff_x, dest[1] + diff_y)
+    if 0 <= p1[0] < MAX_X and 0 <= p1[1] < MAX_Y:
+        res.append(p1)
+
+    p2 = (s[0] - diff_x, s[1] - diff_y)
+    if 0 <= p2[0] < MAX_X and 0 <= p2[1] < MAX_Y:
+        res.append(p2)
+
+    return res
+
+antennas = {}
+freq = ''
+for y in range(0, MAX_Y):
+    for x in range(0, MAX_X):
+        if input_lines[y][x] != '.':
+            freq = input_lines[y][x]
+            # print(f'found {freq=}')
+            if freq in antennas:
+                l = antennas[freq]
+                l.append((x, y))
+            else:
+                antennas[freq] = [(x, y)]
+
+antinodes = set()
+for freq, antennas_list in antennas.items():
+    print(f'\nfreq {freq} list: {antennas_list}')
+    for antenna in antennas_list:
+        for other in antennas_list:
+            if other != antenna:
+                for a in find_antinode(antenna, other):
+                    antinodes.add(a)
+
+print(f'{antinodes=}')
+print(f'{len(antinodes)}')

2024/8/input.txt

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+...........6.b....................................
+........6................8........................
+..Y.......................................o.......
+....V...j............B.............c..............
+............8.........X.......L...................
+.....j..v6.......3.L..................c...........
+..Mj.....p3.......b........Z....................J.
+..........M...X...................................
+V..............v......p.........Z.........c.......
+..............3...................................
+.......V......U3.............c....................
+..........b..v.M.U8...............................
+..........j........8.....................J........
+..........Y......q........LH..Z...D...........y...
+..2Y........PX......6..................BQ.........
+...0.Y...............XP...........w...............
+.........U.......2...............oH.y.............
+0..............9........U.........................
+...........P..............W.......z...Oy..........
+...................t...p.W..o.............Q.......
+.....S.................t.....Q....B...............
+S.k..................V..W...p.......H...O......m..
+....S.h................W.......................O..
+..h..P.2.............Z.............J..............
+.........k.......5v.......q...t.s.................
+.....Q.....h..........................J...B.......
+........0.........l...............................
+.S................................................
+.............................M....................
+2..................e.....o.....y..................
+................k.................................
+......4......k....t...s.q.........................
+.4.......................q........................
+.......................z....E.....................
+.............0.....d..............................
+7..........D........z.............................
+.......D..5......7..9.............................
+......5..................E........................
+D..............K......d..9E..........w.....1..C...
+.......K..x.........d....s...........l............
+........7......................u...C..............
+..K........x..............9..C...u................
+4..............s.........................l...T..w.
+.......5.....7..................m......T......1...
+...........................E...z.m................
+......................................u...C.......
+.............................em...................
+..............................................T...
+....................x.......................e.....
+.............................1e....w....l.........

2024/8/input_example.txt

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+............
+........0...
+.....0......
+.......0....
+....0.......
+......A.....
+............
+............
+........A...
+.........A..
+............
+............