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群组: 数学建模 群组: 数学趣味、游戏、IQ等 群组: 趣味数学 群组: 加油数模,加油美国赛。 群组: 南京邮电大学数模协会 |
Sudoku is played over a 9x9 grid, divided to 3x3 sub grids called "regions": ) m: r8 d. ^- r! D% ~: Z
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6 {5 T5 K" |. mRegion ( g9 b+ P7 S8 U& W! r2 B5 ` m8 i
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x; D3 u |$ o& @/ b1 n: e- Sudoku begins with some of the grid cells already filled with numbers: + ?; q- q) k) e$ W- U3 E
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. o; _: _4 w. v3 R% u% N- The object of Sudoku is to fill the other empty cells with numbers between 1 and 9 (1 number only in each cell) according the following guidelines: $ A& B$ q: g" x+ w% @# Q+ A
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1. Number can appear only once on each row:
" Z7 ]; x6 s, |- T5 u, C5 s3 j0 L8 Z" F# B5 t6 U* ^# a
Allowed , ?( g& U m' F7 S; M3 w
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Not allowed
) K6 p) j$ {2 N8 u
( n/ D, b# |( s- f* F3 j' U2. Number can appear only once on each column:
' E, Y/ Y8 d3 E0 h# j" q6 P. ?0 c7 k
Allowed Not allowed
7 k3 [3 V. Q1 b0 N- p/ M * ?- M9 f7 w2 Z6 m1 d4 B
0 v d* s6 J, q2 V3. Number can appear only once on each region: # v2 l9 p- h: j- K
7 S2 S7 N: Q; M3 L& `
Allowed Not allowed 5 Q& ?2 ~) W7 n# P/ c" J+ ]
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8 g7 z' h. D+ v3 C! ]4 [7 O/ A1 j- A summary of these guidelines would be, that a number should appear only once on each row, column and a region. |
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