C++ 优先队列 自定义优先规则。
基础用法省略。
标签：STL
Codeforces-1000A Codehorses T-shirts
Codehorses has just hosted the second Codehorses Cup. This year, the same as the previous one, organizers are giving T-shirts for the winners.
The valid sizes of T-shirts are either “M” or from 0 to 3 “X” followed by “S” or “L”. For example, sizes “M”, “XXS”, “L”, “XXXL” are valid and “XM”, “Z”, “XXXXL” are not.