|
|
|
|
REM Advent of Code 2022: Day 6, part 1 and 2
|
|
|
|
|
REM Written in Applesoft BASIC
|
|
|
|
|
|
|
|
|
|
5 HOME
|
|
|
|
|
10 R1 = 3
|
|
|
|
|
20 R2 = 13
|
|
|
|
|
30 G1 = 0
|
|
|
|
|
40 G2 = 0
|
|
|
|
|
50 M = 0
|
|
|
|
|
50 PRINT CHR$ (4),"OPEN INPUT"
|
|
|
|
|
60 PRINT CHR$ (4),"READ INPUT"
|
|
|
|
|
70 ONERR GOTO 900
|
|
|
|
|
|
|
|
|
|
REM Print some fun messages, going for a hacker feel.
|
|
|
|
|
REM The routine at 1000 spins an empty FOR I = 0 TO A loop for a delay.
|
|
|
|
|
|
|
|
|
|
100 PRINT "INITIALIZING COMMUNICATION SYSTEM";
|
|
|
|
|
105 A = 350
|
|
|
|
|
110 FOR I = 0 TO 6
|
|
|
|
|
120 GOSUB 1000
|
|
|
|
|
130 PRINT ".";
|
|
|
|
|
140 NEXT I
|
|
|
|
|
150 PRINT
|
|
|
|
|
200 PRINT "OPENING SIGNAL DATASTREAM";
|
|
|
|
|
210 FOR I = 0 TO 6
|
|
|
|
|
220 GOSUB 1000
|
|
|
|
|
230 PRINT ".";
|
|
|
|
|
240 NEXT I
|
|
|
|
|
250 PRINT : PRINT
|
|
|
|
|
300 PRINT "SCANNING FOR START-OF-PACKET MARKER:"
|
|
|
|
|
|
|
|
|
|
310 HTAB 1
|
|
|
|
|
320 VTAB 8
|
|
|
|
|
330 PRINT "||||";
|
|
|
|
|
340 HTAB 1
|
|
|
|
|
350 VTAB 10
|
|
|
|
|
360 PRINT "||||||||||||||";
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
REM Main loop: Print the current string. If it can be checked for uniqueness,
|
|
|
|
|
REM GOTO 500 (which comes back to 440). At 440, we add the next character to
|
|
|
|
|
REM the string and trim off the end if its too long.
|
|
|
|
|
|
|
|
|
|
400 HTAB 1
|
|
|
|
|
403 VTAB 9
|
|
|
|
|
406 PRINT S$;
|
|
|
|
|
410 GET C$
|
|
|
|
|
413 S$ = C$ + S$
|
|
|
|
|
420 IF LEN (S$) > 40 THEN S$ = MID$ (S$,1,40)
|
|
|
|
|
430 IF M > 0 THEN M = M - 1: GOTO 400
|
|
|
|
|
440 IF G1 = 0 AND LEN (S$) > = 4 THEN GOSUB 500
|
|
|
|
|
450 IF G2 = 0 AND LEN (S$) > = 14 THEN GOSUB 2200
|
|
|
|
|
460 IF G1 = 1 AND G2 = 1 GOTO 900
|
|
|
|
|
480 GOTO 400
|
|
|
|
|
|
|
|
|
|
REM Here, we check for matching characters. It's hard-coded because there are
|
|
|
|
|
REM only a few combinations. A little ASCII art "connects" the matched bytes.
|
|
|
|
|
REM GOTO 700 if all unique, otherwise back to 440 for the next character.
|
|
|
|
|
|
|
|
|
|
500 R1 = R1 + 1
|
|
|
|
|
500 HTAB 1
|
|
|
|
|
510 VTAB 7
|
|
|
|
|
530 IF MID$ (S$,1,1) = MID$ (S$,2,1) THEN PRINT "/\ ";
|
|
|
|
|
540 IF MID$ (S$,1,1) = MID$ (S$,3,1) THEN PRINT "/-\ ";
|
|
|
|
|
550 IF MID$ (S$,1,1) = MID$ (S$,4,1) THEN PRINT "/--\";
|
|
|
|
|
560 IF MID$ (S$,2,1) = MID$ (S$,3,1) THEN PRINT " /\ ";
|
|
|
|
|
570 IF MID$ (S$,2,1) = MID$ (S$,4,1) THEN PRINT " /-\";
|
|
|
|
|
580 IF MID$ (S$,3,1) = MID$ (S$,4,1) THEN PRINT " /\";
|
|
|
|
|
590 PRINT " ";
|
|
|
|
|
700 HTAB 1
|
|
|
|
|
710 VTAB 13
|
|
|
|
|
715 A = 1300
|
|
|
|
|
718 G1 = 1
|
|
|
|
|
720 PRINT "MARKER FOUND AT INDEX ";R;"."
|
|
|
|
|
599 RETURN
|
|
|
|
|
|
|
|
|
|
REM I keep the exit routine at 900 out of habit.
|
|
|
|
|
|
|
|
|
|
900 PRINT CHR$ (4),"CLOSE"
|
|
|
|
|
910 END
|
|
|
|
|
|
|
|
|
|
REM The delay routine.
|
|
|
|
|
|
|
|
|
|
1000 FOR Z = 0 TO A: NEXT Z
|
|
|
|
|
1010 RETURN
|
|
|
|
|
|
|
|
|
|
REM Search for a matching pair. If found, store 2nd index in M.
|
|
|
|
|
|
|
|
|
|
2200 I = 1
|
|
|
|
|
2205 M = 0
|
|
|
|
|
2210 FOR J = I + 1 TO 14
|
|
|
|
|
2220 IF MID$ (S$,I,1) = MID$ (S$,J,1) THEN M = J:J = 14
|
|
|
|
|
2230 NEXT J
|
|
|
|
|
2240 IF M < > 0 GOTO 2300
|
|
|
|
|
|
|
|
|
|
REM If no matches, move to next index and repeat.
|
|
|
|
|
REM If we've gone through all indices, marker found. GOTO 2400.
|
|
|
|
|
|
|
|
|
|
2250 I = I + 1
|
|
|
|
|
2260 IF I < 14 GOTO 2200
|
|
|
|
|
|
|
|
|
|
2270 HTAB 1
|
|
|
|
|
2275 VTAB 23
|
|
|
|
|
2280 G2 = 1
|
|
|
|
|
2285 PRINT "MESSAGE FOUND AT INDEX ";R"."
|
|
|
|
|
2290 RETURN
|
|
|
|
|
|
|
|
|
|
REM A match was found. Show dashes between the two characters.
|
|
|
|
|
|
|
|
|
|
2300 HTAB I
|
|
|
|
|
2310 VTAB 11
|
|
|
|
|
2314 PRINT " ";
|
|
|
|
|
2318 HTAB I
|
|
|
|
|
2320 FOR J = I TO M
|
|
|
|
|
2330 PRINT "-";
|
|
|
|
|
2340 NEXT J
|
|
|
|
|
2345 M = 14 - M
|
|
|
|
|
2350 RETURN
|
|
|
|
|
|
