/in/foo.cc: In function 'int main()':
/in/foo.cc:55:3: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   if(it!=s.begin())l=*--it;it++;
   ^~
/in/foo.cc:55:28: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   if(it!=s.begin())l=*--it;it++;
                            ^~