UVa 1254
UVa 361 Credit: https://github.com/juanplopes/icpc/blob/master/uva/361.cpp
UVa 10256
Some parts of the codes inspired by http://mypaper.pchome.com.tw/zerojudge/post/1323985798
UVa 681
UVa 11096
fixed a bug with point
UVa 11265