mirror of
https://github.com/diemheych/PrimeFORTH
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48 lines
731 B
Forth
48 lines
731 B
Forth
8 constant rr
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variable ii
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variable ss
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variable xx
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variable yy
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create aa rr 1 + allot
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: rclaa @ aa + @ ;
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: stoaa @ aa + ! ;
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: NQPRINT
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1 II !
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BEGIN
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II RCLAA .
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1 II +!
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II @ XX @ 1 + = until
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;
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: NQCORE
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0 SS !
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0 XX !
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BEGIN
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1 XX +!
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RR XX STOAA
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BEGIN
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1 SS +!
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XX @ YY !
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BEGIN YY @ DUP II ! 1 > IF
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-1 YY +!
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XX RCLAA YY RCLAA - DUP
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0 = SWAP ABS XX @ YY @ - = OR IF
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0 YY !
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BEGIN XX RCLAA 1 - DUP XX STOAA DUP 0 = IF
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-1 XX +!
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then
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0 <>
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UNTIL
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THEN
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THEN
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II @ 2 <
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UNTIL
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YY @ 1 = UNTIL
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RR XX @ = UNTIL
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;
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: NQUEENS
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NQCORE
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NQPRINT
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;
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