View Compilation Error

0_0_1689260_24708.cpp: In function `int find(int)':
0_0_1689260_24708.cpp:11: error: `x' undeclared (first use this function)
0_0_1689260_24708.cpp:11: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_1689260_24708.cpp:11: error: `fa' undeclared (first use this function)