foo.cc: In function 'int main()':
foo.cc:26:19: warning: 'w' may be used uninitialized in this function [-Wmaybe-uninitialized]
  register int v,n,w;scanf("%d%d",&v,&n);
                   ^

自豪的采用jd5进行评测(github.com/masnn/jd5)

{"receive":"2020-02-26T07:29:29.626Z","handle":"2020-02-26T07:29:29.626Z","cache_start":"2020-02-26T07:29:29.626Z","read_cases":"2020-02-26T07:29:29.934Z","judge":"2020-02-26T07:29:29.938Z","done":"2020-02-26T07:29:33.129Z"}