/in/foo.cc: In function 'int main()':
/in/foo.cc:73:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(int i=1;i<=n;i++)
  ^~~
/in/foo.cc:81:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
   if(flag==0) 
   ^~
/in/foo.cc:83:17: warning: 'summall' may be used uninitialized in this function [-Wmaybe-uninitialized]
    cout<<summall;
                 ^