Original title: http://acm.hdu.edu.cn/showproblem.php?pid=6532
Meaning of the questions:
A plurality of given points on the board, and a plurality of restrictions, R 2 3 represents the value of x is greater than 2 can not be equal to more than 3, y empathy. Each point of value, ask the greatest value.
Resolution:
Here are construction cost flow, so you can guarantee to limit the rows and columns are not broken. Code is too lazy to knock QAQ
