Data update
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12390 changed files with 318560 additions and 27248 deletions
183
Task/Floyd-Warshall-algorithm/COBOL/floyd-warshall-algorithm.cob
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183
Task/Floyd-Warshall-algorithm/COBOL/floyd-warshall-algorithm.cob
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IDENTIFICATION DIVISION.
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PROGRAM-ID. FLOYD-WARSHALL.
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DATA DIVISION.
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WORKING-STORAGE SECTION.
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01 WS-NUM-VERTICES PIC 9 VALUE 4.
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01 WS-NUM-WEIGHTS PIC 9 VALUE 5.
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01 WS-INFINITY PIC 9(7)V9(2) VALUE 9999999.99.
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01 WS-WEIGHTS.
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05 WS-W OCCURS 5 TIMES.
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10 WS-FROM PIC 9.
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10 WS-TO PIC 9.
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10 WS-COST PIC S9(3) SIGN LEADING SEPARATE.
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01 WS-DIST.
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05 WS-D OCCURS 4 TIMES.
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10 WS-D-COL OCCURS 4 TIMES.
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15 WS-DIST-VAL PIC S9(7)V9(2).
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01 WS-NEXT.
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05 WS-N OCCURS 4 TIMES.
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10 WS-N-COL OCCURS 4 TIMES.
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15 WS-NEXT-VAL PIC 9.
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01 WS-I PIC 9.
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01 WS-J PIC 9.
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01 WS-K PIC 9.
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01 WS-U PIC 9.
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01 WS-V PIC 9.
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01 WS-IDX PIC 9.
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01 WS-TEMP-SUM PIC S9(7)V9(2).
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01 WS-DIST-IJ PIC S9(7)V9(2).
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01 WS-DIST-IK PIC S9(7)V9(2).
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01 WS-DIST-KJ PIC S9(7)V9(2).
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*> Path and display working fields
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01 WS-PATH PIC X(200).
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01 WS-PATH-TEMP PIC X(200).
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01 WS-DIST-INT PIC S9(5).
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01 WS-DIST-EDIT PIC -(4)9.
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01 WS-DIST-TRIM PIC X(6).
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01 WS-OUTPUT-LINE PIC X(80).
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01 WS-NODE-CHAR PIC 9.
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PROCEDURE DIVISION.
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MAIN-PARA.
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MOVE 1 TO WS-FROM(1)
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MOVE 3 TO WS-TO(1)
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MOVE -2 TO WS-COST(1)
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MOVE 2 TO WS-FROM(2)
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MOVE 1 TO WS-TO(2)
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MOVE 4 TO WS-COST(2)
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MOVE 2 TO WS-FROM(3)
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MOVE 3 TO WS-TO(3)
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MOVE 3 TO WS-COST(3)
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MOVE 3 TO WS-FROM(4)
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MOVE 4 TO WS-TO(4)
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MOVE 2 TO WS-COST(4)
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MOVE 4 TO WS-FROM(5)
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MOVE 2 TO WS-TO(5)
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MOVE -1 TO WS-COST(5)
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PERFORM INIT-DIST
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PERFORM INIT-NEXT
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PERFORM FLOYD-WARSHALL
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PERFORM PRINT-RESULT
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STOP RUN.
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INIT-DIST.
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PERFORM VARYING WS-I FROM 1 BY 1
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UNTIL WS-I > WS-NUM-VERTICES
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PERFORM VARYING WS-J FROM 1 BY 1
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UNTIL WS-J > WS-NUM-VERTICES
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MOVE WS-INFINITY TO WS-DIST-VAL(WS-I, WS-J)
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END-PERFORM
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END-PERFORM
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PERFORM VARYING WS-IDX FROM 1 BY 1
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UNTIL WS-IDX > WS-NUM-WEIGHTS
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MOVE WS-FROM(WS-IDX) TO WS-I
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MOVE WS-TO(WS-IDX) TO WS-J
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MOVE WS-COST(WS-IDX) TO WS-DIST-VAL(WS-I, WS-J)
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END-PERFORM.
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INIT-NEXT.
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PERFORM VARYING WS-I FROM 1 BY 1
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UNTIL WS-I > WS-NUM-VERTICES
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PERFORM VARYING WS-J FROM 1 BY 1
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UNTIL WS-J > WS-NUM-VERTICES
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IF WS-I NOT EQUAL WS-J
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MOVE WS-J TO WS-NEXT-VAL(WS-I, WS-J)
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ELSE
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MOVE 0 TO WS-NEXT-VAL(WS-I, WS-J)
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END-IF
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END-PERFORM
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END-PERFORM.
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FLOYD-WARSHALL.
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PERFORM VARYING WS-K FROM 1 BY 1
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UNTIL WS-K > WS-NUM-VERTICES
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PERFORM VARYING WS-I FROM 1 BY 1
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UNTIL WS-I > WS-NUM-VERTICES
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PERFORM VARYING WS-J FROM 1 BY 1
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UNTIL WS-J > WS-NUM-VERTICES
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MOVE WS-DIST-VAL(WS-I, WS-K) TO WS-DIST-IK
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MOVE WS-DIST-VAL(WS-K, WS-J) TO WS-DIST-KJ
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MOVE WS-DIST-VAL(WS-I, WS-J) TO WS-DIST-IJ
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IF WS-DIST-IK < WS-INFINITY AND
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WS-DIST-KJ < WS-INFINITY
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COMPUTE WS-TEMP-SUM =
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WS-DIST-IK + WS-DIST-KJ
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IF WS-TEMP-SUM < WS-DIST-IJ
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MOVE WS-TEMP-SUM
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TO WS-DIST-VAL(WS-I, WS-J)
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MOVE WS-NEXT-VAL(WS-I, WS-K)
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TO WS-NEXT-VAL(WS-I, WS-J)
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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-PERFORM.
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PRINT-RESULT.
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DISPLAY "pair dist path"
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PERFORM VARYING WS-I FROM 1 BY 1
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UNTIL WS-I > WS-NUM-VERTICES
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PERFORM VARYING WS-J FROM 1 BY 1
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UNTIL WS-J > WS-NUM-VERTICES
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IF WS-I NOT EQUAL WS-J
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*> Set up source and destination
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MOVE WS-I TO WS-U
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MOVE WS-J TO WS-V
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*> Seed path with just the source node
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MOVE SPACES TO WS-PATH
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MOVE WS-I TO WS-NODE-CHAR
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MOVE WS-NODE-CHAR TO WS-PATH(1:1)
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*> Walk next-hop until we reach destination
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PERFORM UNTIL WS-U = WS-V
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MOVE WS-NEXT-VAL(WS-U, WS-V) TO WS-U
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MOVE WS-U TO WS-NODE-CHAR
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MOVE SPACES TO WS-PATH-TEMP
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STRING
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FUNCTION TRIM(WS-PATH TRAILING)
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DELIMITED SIZE
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" -> " DELIMITED SIZE
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WS-NODE-CHAR DELIMITED SIZE
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INTO WS-PATH-TEMP
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MOVE WS-PATH-TEMP TO WS-PATH
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END-PERFORM
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*> Format distance: move to integer then edit picture
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*> to get clean signed number without leading zeros
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COMPUTE WS-DIST-INT =
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WS-DIST-VAL(WS-I, WS-J)
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MOVE WS-DIST-INT TO WS-DIST-EDIT
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MOVE FUNCTION TRIM(WS-DIST-EDIT LEADING)
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TO WS-DIST-TRIM
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*> Assemble and print output line
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MOVE SPACES TO WS-OUTPUT-LINE
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STRING
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WS-I DELIMITED SIZE
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" -> " DELIMITED SIZE
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WS-J DELIMITED SIZE
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" " DELIMITED SIZE
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FUNCTION TRIM(WS-DIST-TRIM LEADING)
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DELIMITED SIZE
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" " DELIMITED SIZE
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FUNCTION TRIM(WS-PATH TRAILING)
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DELIMITED SIZE
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INTO WS-OUTPUT-LINE
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DISPLAY FUNCTION TRIM(WS-OUTPUT-LINE TRAILING)
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END-IF
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END-PERFORM
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END-PERFORM.
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