View Compilation Error

0_0_36913585_13178.cpp:71:32: error: 'get' function uses 'auto' type specifier without trailing return type
     auto/*ull*/ get(int l,int r) /*-> ull*/ { return hash1[r]-hash1[l-1]*pow[r-l+1]; };
                                ^
0_0_36913585_13178.cpp:71:32: note: deduced return type only available with -std=c++1y or -std=gnu++1y