day3 2025HEADmain

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+       IDENTIFICATION DIVISION.
+       PROGRAM-ID. day_03.
+       AUTHOR. Trey Bastian.
+       ENVIRONMENT DIVISION.
+       INPUT-OUTPUT SECTION.
+       FILE-CONTROL.
+       SELECT input-file ASSIGN TO "./input.txt"
+           ORGANIZATION IS LINE SEQUENTIAL.
+       DATA DIVISION.
+       FILE SECTION.
+       FD input-file.
+       01 input-line PIC Z(4096). 
+       WORKING-STORAGE SECTION.
+       01 idx PIC 9(4).
+       01 idx-2 PIC 9(4).
+       01 len PIC 9(4).
+
+       01 maxim PIC 9 VALUE 0.
+       01 digit PIC 9 VALUE 0.
+
+       01 joltage PIC XX.
+       01 result PIC 9(10) VALUE 0.
+
+       
+       01 eof PIC X.
+           88 eof-y VALUE "Y".
+           88 eof-n VALUE "N".
+
+       PROCEDURE DIVISION.
+         OPEN INPUT input-file.
+         SET eof-n to TRUE.
+         PERFORM UNTIL eof-y
+             READ input-file AT END
+                 SET eof-y to TRUE
+             NOT AT END
+                MOVE FUNCTION LENGTH(FUNCTION TRIM(input-line)) TO len
+                MOVE 0 TO maxim
+      *first pass leave something on the right
+                PERFORM VARYING idx FROM 1 UNTIL idx > len - 1 
+                    MOVE FUNCTION NUMVAL(input-line(idx:1)) TO digit
+                    IF maxim < digit
+                      MOVE digit TO maxim
+                      MOVE idx TO idx-2
+                    END-IF
+                END-PERFORM 
+      * need the next index 
+                MOVE maxim TO joltage(1:1)
+                MOVE 0 TO maxim
+                ADD 1 TO idx-2 
+                PERFORM VARYING idx-2 FROM idx-2  UNTIL idx-2 > len
+                  MOVE FUNCTION NUMVAL(input-line(idx-2:1)) TO digit
+                  IF maxim < digit
+                    MOVE digit TO maxim
+                  END-IF
+                END-PERFORM
+                MOVE maxim TO joltage(2:1)
+                ADD FUNCTION NUMVAL(joltage) TO result
+              END-READ
+         END-PERFORM.
+         CLOSE input-file.
+         DISPLAY result.
+       STOP-RUN.
+