COBOL as usual
IDENTIFICATION DIVISION. PROGRAM-ID. AOC-2020-15-2. AUTHOR ANNA KOSIERADZKA. DATA DIVISION. WORKING-STORAGE SECTION. 01 WS-INPUT PIC 9(4) OCCURS 8 TIMES. 01 N PIC 9. 01 N1 PIC 9. 01 WS-NUMBERS OCCURS 67108864 TIMES. 05 NUM-LAST PIC 9(8) VALUE 0. 05 NUM-PREV PIC 9(8) VALUE 0. 01 LAST-NUM PIC 9(8) VALUE 0. 01 SPOKEN-NUM PIC 9(8) VALUE 0. 01 LAST-I PIC 9(8) VALUE 0. 01 PREV-I PIC 9(8) VALUE 0. 01 I PIC 9(8) VALUE 1. PROCEDURE DIVISION. 001-MAIN. PERFORM INIT-DATA. PERFORM SPEAK-NUMBERS. STOP RUN. INIT-DATA. MOVE 6 TO N. *2,15,0,9,1,20 MOVE 2 TO WS-INPUT(1). MOVE 15 TO WS-INPUT(2). MOVE 0 TO WS-INPUT(3). MOVE 9 TO WS-INPUT(4). MOVE 1 TO WS-INPUT(5). MOVE 20 TO WS-INPUT(6). SPEAK-NUMBERS. PERFORM VARYING I FROM 1 BY 1 UNTIL I > N MOVE WS-INPUT(I) TO LAST-NUM MOVE I TO NUM-LAST(LAST-NUM + 1) END-PERFORM. COMPUTE N1 = N + 1. PERFORM VARYING I FROM N1 BY 1 UNTIL I > 30000000 COMPUTE LAST-I = NUM-LAST(LAST-NUM + 1) COMPUTE PREV-I = NUM-PREV(LAST-NUM + 1) IF PREV-I = 0 THEN COMPUTE SPOKEN-NUM = 0 ELSE COMPUTE SPOKEN-NUM = LAST-I - PREV-I END-IF * DISPLAY I ":" LAST-NUM "->" SPOKEN-NUM MOVE NUM-LAST(SPOKEN-NUM + 1) TO NUM-PREV(SPOKEN-NUM + 1) COMPUTE NUM-LAST(SPOKEN-NUM + 1) = I COMPUTE LAST-NUM = SPOKEN-NUM END-PERFORM. DISPLAY LAST-NUM.
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COBOL as usual