View Compilation Error

0_0_37844337_2111.cpp: In function 'int main()':
0_0_37844337_2111.cpp:64:24: error: 'add' was not declared in this scope
     if(w<=n-1)add(i,j,w);E.push_back(U(i,j,w)); 
                        ^
0_0_37844337_2111.cpp:69:60: error: 'add' was not declared in this scope
     if(w<=n-1)add(vis[i],vis[j],abs(vis[i]-vis[j])*abs(i-j));
                                                            ^