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MODULE Ch2 EXPORTS Main;
IMPORT SIO;
VAR
A1 := ARRAY[0..3],[0..1] OF INTEGER{
ARRAY[0..1] OF INTEGER{1,2},
ARRAY[0..1] OF INTEGER{3,1},
ARRAY[0..1] OF INTEGER{2,4},
ARRAY[0..1] OF INTEGER{2,3}};
A2 := ARRAY[0..3],[0..1] OF INTEGER{
ARRAY[0..1] OF INTEGER{3,4},
ARRAY[0..1] OF INTEGER{2,3},
ARRAY[0..1] OF INTEGER{1,5},
ARRAY[0..1] OF INTEGER{2,5}};
A3 := ARRAY[0..2],[0..1] OF INTEGER{
ARRAY[0..1] OF INTEGER{2,2},
ARRAY[0..1] OF INTEGER{3,3},
ARRAY[0..1] OF INTEGER{4,4}};
A4 := ARRAY[0..3],[0..1] OF INTEGER{
ARRAY[0..1] OF INTEGER{0,1},
ARRAY[0..1] OF INTEGER{1,0},
ARRAY[0..1] OF INTEGER{0,2},
ARRAY[0..1] OF INTEGER{2,0}};
A5 := ARRAY[0..3],[0..1] OF INTEGER{
ARRAY[0..1] OF INTEGER{5,6},
ARRAY[0..1] OF INTEGER{6,5},
ARRAY[0..1] OF INTEGER{5,4},
ARRAY[0..1] OF INTEGER{4,5}};
PROCEDURE NearestValidPoint(VAR A:ARRAY OF ARRAY OF INTEGER;
READONLY X,Y:INTEGER):INTEGER =
VAR
Res := -1;
Min := LAST(INTEGER);
D:INTEGER;
BEGIN
FOR I := FIRST(A) TO LAST(A) DO
WITH X1 = A[I,FIRST(A)],Y1 = A[I,FIRST(A)+1] DO
IF X1 = X OR Y1 = Y THEN
D := ABS(X1 - X) + ABS(Y1 - Y);
IF D < Min THEN
Min := D;
Res := I
END
END
END
END;
RETURN Res
END NearestValidPoint;
BEGIN
SIO.PutInt(NearestValidPoint(A1,3,4)); SIO.Nl();
SIO.PutInt(NearestValidPoint(A2,2,5)); SIO.Nl();
SIO.PutInt(NearestValidPoint(A3,1,1)); SIO.Nl();
SIO.PutInt(NearestValidPoint(A4,0,0)); SIO.Nl();
SIO.PutInt(NearestValidPoint(A5,5,5)); SIO.Nl()
END Ch2.
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