View Compilation Error

0_0_26933149_1154.cpp: In function 'void Solve()':
0_0_26933149_1154.cpp:79:34: error: 'Find' was not declared in this scope
                     LL u=Find(i,U);
                                  ^
0_0_26933149_1154.cpp:109:35: error: 'Find' was not declared in this scope
                 U[i]=f[i]=Find(i,f);
                                   ^
0_0_26933149_1154.cpp:119:24: error: 'Find' was not declared in this scope
         int a1=Find(a,f);
                        ^