View Compilation Error

0_0_7681983_10533.cpp: In function `int find(int)':
0_0_7681983_10533.cpp:6: error: `pre' cannot be used as a function
0_0_7681983_10533.cpp:7: error: `pre' cannot be used as a function
0_0_7681983_10533.cpp: In function `int main()':
0_0_7681983_10533.cpp:23: error: `pre' cannot be used as a function