commit b8038908764e7ff9c9f5449b0753a05f9fb1dcef · treybastian.com/advent-of-code

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2025/day_02.cbl

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              IDENTIFICATION DIVISION.

     

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              PROGRAM-ID. day_02.

     

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              AUTHOR. Trey Bastian.

     

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              ENVIRONMENT DIVISION.

     

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              INPUT-OUTPUT SECTION.

     

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              FILE-CONTROL.

     

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              SELECT input-file ASSIGN TO "./input.txt"

     

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                  ORGANIZATION IS LINE SEQUENTIAL.

     

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              DATA DIVISION.

     

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              FILE SECTION.

     

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              FD input-file.

     

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              01 input-line PIC X(4096). 

     

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              WORKING-STORAGE SECTION.

     

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              01 ptr PIC 9(4) Value 1.

     

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              01 len PIC 9(4).

     

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              01 left-val PIC 9(32).

     

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              01 right-val PIC 9(32).

     

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              01 grouping PIC X(65).

     

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              01 val-string PIC Z(32).

     

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              01 val-string-len PIC 9(2).

     

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              01 val-string-start-idx PIC 9(2).

     

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              01 val-string-half PIC 9(2).

     

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              01 result PIC 9(32) VALUE ZEROS.

     

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              01 eof PIC X.

     

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                  88 eof-y VALUE "Y".

     

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                  88 eof-n VALUE "N".

     

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              PROCEDURE DIVISION.

     

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                OPEN INPUT input-file.

     

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                SET eof-n to TRUE.

     

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                PERFORM UNTIL eof-y

     

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                    READ input-file AT END

     

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                        SET eof-y to TRUE

     

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                    NOT AT END

     

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                     INSPECT input-line TALLYING len FOR CHARACTERS BEFORE

     

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                     SPACE

     

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                     PERFORM UNTIL ptr > len

     

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                       UNSTRING input-line DELIMITED BY "," INTO grouping WITH

     

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                       POINTER ptr

     

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                       END-UNSTRING

     

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                       UNSTRING grouping DELIMITED BY "-" INTO left-val,

     

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                       right-val

     

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                       END-UNSTRING

     

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                       PERFORM VARYING  left-val FROM left-val BY 1 UNTIL

     

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                         left-val > right-val

     

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                         MOVE left-val TO val-string

     

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                         COMPUTE val-string-len = FUNCTION LENGTH(FUNCTION

     

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                         TRIM(val-string))

     

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                         IF FUNCTION MOD(val-string-len, 2) = 0

     

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                           COMPUTE val-string-start-idx = 

     

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                           (FUNCTION LENGTH(val-string) - val-string-len ) + 1

     

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                           COMPUTE val-string-half = val-string-len / 2

     

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                           IF val-string(val-string-start-idx:val-string-half) 

     

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                             = val-string(val-string-start-idx +

     

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                             val-string-half:val-string-half)

     

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                             ADD left-val TO result 

     

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                           END-IF

     

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                         END-IF

     

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                       END-PERFORM

     

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                     END-PERFORM

     

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                     END-READ

     

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                END-PERFORM.

     

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                CLOSE input-file.

     

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                DISPLAY result.

     

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              STOP-RUN.

     

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+103

2025/day_02_part2.cbl

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              IDENTIFICATION DIVISION.

     

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              PROGRAM-ID. day_02_part2.

     

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              AUTHOR. Trey Bastian.

     

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              ENVIRONMENT DIVISION.

     

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              INPUT-OUTPUT SECTION.

     

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              FILE-CONTROL.

     

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              SELECT input-file ASSIGN TO "./input.txt"

     

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                  ORGANIZATION IS LINE SEQUENTIAL.

     

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              DATA DIVISION.

     

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              FILE SECTION.

     

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              FD input-file.

     

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              01 input-line PIC X(4096). 

     

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              WORKING-STORAGE SECTION.

     

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              01 ptr PIC 9(4) Value 1.

     

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              01 len PIC 9(4).

     

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              01 left-val PIC 9(32).

     

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              01 right-val PIC 9(32).

     

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              01 grouping PIC X(65).

     

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              01 val-string PIC Z(32).

     

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              01 val-string-len PIC 9(2).

     

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              01 val-string-start-idx PIC 9(2).

     

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              01 val-string-half PIC 9(2).

     

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              01 val-window PIC 9(2) VALUE 1. 

     

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              01 c-idx PIC 9(2).

     

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              01 s-left PIC Z(16).

     

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              01 s-right PIC Z(16).

     

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              01 no-match PIC X VALUE "N".

     

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              01 result PIC 9(32) VALUE ZEROS.

     

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              01 eof PIC X.

     

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                  88 eof-y VALUE "Y".

     

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                  88 eof-n VALUE "N".

     

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              PROCEDURE DIVISION.

     

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                OPEN INPUT input-file.

     

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                SET eof-n to TRUE.

     

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                PERFORM UNTIL eof-y

     

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                    READ input-file AT END

     

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                        SET eof-y to TRUE

     

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                    NOT AT END

     

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                     INSPECT input-line TALLYING len FOR CHARACTERS BEFORE

     

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                     SPACE

     

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                     PERFORM UNTIL ptr > len

     

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                       UNSTRING input-line DELIMITED BY "," INTO grouping WITH

     

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                       POINTER ptr

     

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                       END-UNSTRING

     

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                       UNSTRING grouping DELIMITED BY "-" INTO left-val,

     

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                       right-val

     

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                       END-UNSTRING

     

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                       PERFORM VARYING  left-val FROM left-val BY 1 UNTIL

     

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                         left-val > right-val

     

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                         MOVE left-val TO val-string

     

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                         COMPUTE val-string-len = FUNCTION LENGTH(FUNCTION

     

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                         TRIM(val-string))

     

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                         COMPUTE val-string-start-idx = 

     

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                         (FUNCTION LENGTH(val-string) - val-string-len ) + 1

     

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                         COMPUTE val-string-half = val-string-len / 2

     

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                         PERFORM VARYING val-window FROM 1 BY 1 

     

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                           UNTIL val-window > val-string-half

     

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                           COMPUTE c-idx = val-string-start-idx + val-window

     

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                           MOVE "N" to no-match

     

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                           PERFORM VARYING c-idx 

     

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                             FROM c-idx 

     

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                             BY val-window

     

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                             UNTIL c-idx

     

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                             > FUNCTION LENGTH(val-string)  

     

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                             MOVE val-string(val-string-start-idx:val-window)

     

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                             TO s-left

     

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                             IF (c-idx + val-window 

     

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                               > FUNCTION LENGTH(val-string))

     

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                                  MOVE val-string(c-idx:) TO s-right

     

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                              ELSE

     

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                                  MOVE val-string(c-idx:val-window) TO s-right

     

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                              END-IF

     

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                             IF NOT s-left = s-right 

     

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                               MOVE "Y" to no-match

     

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                               EXIT PERFORM

     

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                             END-IF

     

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                           END-PERFORM

     

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                           IF no-match = "N"

     

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                             ADD left-val to result

     

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                             EXIT PERFORM

     

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                           END-IF

     

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                         END-PERFORM

     

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                       END-PERFORM

     

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                     END-PERFORM

     

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                     END-READ

     

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                END-PERFORM.

     

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                CLOSE input-file.

     

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                DISPLAY result.

     

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              STOP-RUN.

     

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