View Compilation Error

0_0_37734918_21988.cpp:137:33: error: 'query' function uses 'auto' type specifier without trailing return type
     auto query(int u,int l,int r) {
                                 ^
0_0_37734918_21988.cpp:137:33: note: deduced return type only available with -std=c++1y or -std=gnu++1y