foo.cc: In function 'void dp(int)':
foo.cc:22:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(register int i = 0; i < son[x].size(); ++i){
                             ~~^~~~~~~~~~~~~~~

自豪的采用jd5进行评测(github.com/masnn/jd5)

{"receive":"2020-02-16T09:06:20.591Z","handle":"2020-02-16T09:06:20.591Z","cache_start":"2020-02-16T09:06:20.591Z","read_cases":"2020-02-16T09:06:21.308Z","judge":"2020-02-16T09:06:21.308Z","done":"2020-02-16T09:06:22.205Z"}