Tricky.长方形:0<=X<=A, 0<=Y<=B
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jinjing
于
2012-01-21 07:53:56
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1)0<=X<=A/3,0<=Y<=B 2)3)1/3A<=X<2/3A:0<=Y<=1/2B;1/2B<=Y<=B 4)2/3A<=X<=A,0<=Y<=B.
turn 90 degree.