[NOI2011]道路修建

Grade Open Time Friday, 19 September 2014, 10:07 am
Discount 0.8 Time Discount Friday, 26 September 2014, 10:07 am
Allow late Yes Close Time Friday, 26 September 2014, 10:07 am
Input file noi2011_road.in Output file noi2011_road.out


样例如下:

6

1 2 1

1 3 1

1 4 2

6 3 1

5 2 1