View Compilation Error

0_0_33439967_3533.cpp: In function 'int main()':
0_0_33439967_3533.cpp:190:28: error: 'lower_bo' was not declared in this scope
                 it = (int)(lower_bo und(pre + 1, pre + N + 1, k) - pre);
                            ^
0_0_33439967_3533.cpp:190:37: error: expected ')' before 'und'
                 it = (int)(lower_bo und(pre + 1, pre + N + 1, k) - pre);
                                     ^