foo.cc: In function 'int main()':
foo.cc:132:10: warning: unused variable 'k' [-Wunused-variable]
  int i,j,k,l,n,m;
          ^
foo.cc:132:12: warning: unused variable 'l' [-Wunused-variable]
  int i,j,k,l,n,m;
            ^
foo.cc:132:14: warning: unused variable 'n' [-Wunused-variable]
  int i,j,k,l,n,m;
              ^
foo.cc:132:16: warning: unused variable 'm' [-Wunused-variable]
  int i,j,k,l,n,m;
                ^

自豪的采用jd5进行评测(github.com/masnn/jd5)

{"receive":"2020-02-14T01:12:36.276Z","handle":"2020-02-14T01:12:36.276Z","cache_start":"2020-02-14T01:12:36.277Z","read_cases":"2020-02-14T01:12:36.978Z","judge":"2020-02-14T01:12:36.978Z","done":"2020-02-14T01:12:50.404Z"}