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View Compilation Error

0_0_8974804_12487\Main.java:7: 已在 compare(double[][],int,int) 中定义 by
		double dx = a[2][j],by = a[3][j];
		                    ^
0_0_8974804_12487\Main.java:10: 找不到符号
符号: 变量 dy
位置: 类 Main
		double abad = ( bx - ax )*( dy - ay ) - ( by - ay )*( dx - ax );
		                            ^
0_0_8974804_12487\Main.java:11: 找不到符号
符号: 变量 dy
位置: 类 Main
		double cdca = ( dx - cx )*( ay - cy ) - ( dy - cy )*( ax - cx );
		                                          ^
0_0_8974804_12487\Main.java:12: 找不到符号
符号: 变量 dy
位置: 类 Main
		double cdcb = ( dx - cx )*( by - cy ) - ( dy - cy )*( bx - cx );
		                                          ^
4 错误


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