foo.cc: In function 'int main()':
foo.cc:9:8: warning: unused variable 'j' [-Wunused-variable]
  int i,j,k,l,n,maxx=-1;
        ^
foo.cc:9:10: warning: unused variable 'k' [-Wunused-variable]
  int i,j,k,l,n,maxx=-1;
          ^
foo.cc:9:12: warning: unused variable 'l' [-Wunused-variable]
  int i,j,k,l,n,maxx=-1;
            ^

自豪的采用jd5进行评测(github.com/masnn/jd5)

{"receive":"2020-02-14T00:49:36.905Z","handle":"2020-02-14T00:49:36.930Z","cache_start":"2020-02-14T00:49:37.012Z","read_cases":"2020-02-14T00:49:41.407Z","judge":"2020-02-14T00:49:41.408Z","done":"2020-02-14T00:49:44.529Z"}