View Compilation Error

0_0_4179946_24555.cpp: In function `int Union(int, int)':
0_0_4179946_24555.cpp:32: error: `fa' undeclared (first use this function)
0_0_4179946_24555.cpp:32: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4179946_24555.cpp:33: error: `fb' undeclared (first use this function)
0_0_4179946_24555.cpp: In function `int main()':
0_0_4179946_24555.cpp:51: error: `max' undeclared (first use this function)