北大Judge Girl
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-241. Origin in Quadrilateral
The problem with troubleshooting is that trouble shoots back.
Problem
Testdata
0.in
0.out
1.in
1.out
10.in
10.out
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2.out
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3.out
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4.out
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5.out
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6.out
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7.out
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8.out
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9.out