View Compilation Error

0_0_36389396_20289.cpp: In function 'll query(ll)':
0_0_36389396_20289.cpp:27:21: error: expected primary-expression before '^' token
         if( son[p][ ^u ] != 0){
                     ^
0_0_36389396_20289.cpp:28:25: error: expected primary-expression before '^' token
             p = son[p][ ^u ];
                         ^