View Compilation Error

0_0_4010335_16145.cpp: In function `int find(int)':
0_0_4010335_16145.cpp:24: error: `av' undeclared (first use this function)
0_0_4010335_16145.cpp:24: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4010335_16145.cpp:24: error: expected `;' before '}' token