foo.cc: In function 'int main()':
foo.cc:26:35: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
    f[i][j]=max(f[i][j-1],f[i+(1<<j-1)][j-1]);
                                  ~^~
foo.cc:35:7: warning: unused variable 't' [-Wunused-variable]
   int t=log[y-x+1];
       ^

自豪的采用 HydroJudge 进行评测(github.com/hydro-dev/HydroJudge)

{"receive":"2020-08-09T02:15:48.576Z","handle":"2020-08-09T02:15:48.576Z","cache_start":"2020-08-09T02:15:48.585Z","read_cases":"2020-08-09T02:15:48.713Z","judge":"2020-08-09T02:15:48.715Z","done":"2020-08-09T02:15:49.887Z"}