/in/foo.cc: In function 'int main()':
/in/foo.cc:64:3: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   for(int j=1;j<=k;j++)
   ^~~
/in/foo.cc:66:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
     std::cout<<std::setw(2+sgradecnt)<<arr[i].sgrade<<std::endl;
     ^~~
/in/foo.cc: In function 'bool cmp(const excel&, const excel&)':
/in/foo.cc:20:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^