View Compilation Error

0_0_28441858_26923.cpp: In function 'void join(int, int)':
0_0_28441858_26923.cpp:18:17: error: 'findx' was not declared in this scope
     fx = findx(x);
                 ^
0_0_28441858_26923.cpp:21:7: error: 'bin' was not declared in this scope
       bin[fx]=fy;
       ^