input

su 的源代码库

	0	0
	4000	0
	1      -99999
	0    	500
	4000	500
	1      -99999
	0	1000
	1000.	1000
	1692.82 1400.
	2200. 	1400
	4000. 	917.691
	1      -99999
	0       2000
	500.   2000
	1700.   1700.
	2000.0  1400.01
	2200.0  1400.01
	4000.   918
	1 -99999
	0    2000.1
	500  2000.1
	1700  1700.1
	2000  1400.1
	2300.0  1700.
	3500.0  2000
	4000    2000
	1       -99999
	0       2000.2
	4000    2000.2
	1	-99999