View Compilation Error

0_0_29228314_18869.cpp:88:28: error: 'query' function uses 'auto' type specifier without trailing return type
     auto  query(int s,int t){v.clear();find(s,t);return v;}
                            ^
0_0_29228314_18869.cpp:88:28: note: deduced return type only available with -std=c++1y or -std=gnu++1y