/in/foo.cc: In function 'double cal(double)':
/in/foo.cc:13:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(ri i=1;i<=n;i++)
  ^~~
/in/foo.cc:15:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
   return maxx;
   ^~~~~~