View Compilation Error

0_0_16459552_16346.cpp: In function 'int main()':
0_0_16459552_16346.cpp:59:28: error: 'fu' was not declared in this scope
                         if(fu!=fv)
                            ^
0_0_16459552_16346.cpp:59:32: error: 'fv' was not declared in this scope
                         if(fu!=fv)
                                ^