View Compilation Error

0_0_16538532_29928.cpp: In function 'int main()':
0_0_16538532_29928.cpp:33:22: error: 'find' was not declared in this scope
             if(find(a) == find(b))
                      ^
0_0_16538532_29928.cpp:36:27: error: 'unions' was not declared in this scope
                 unions(a,b);
                           ^