View Compilation Error

0_0_26645669_28506.cpp: In function 'void dfs2(int, int)':
0_0_26645669_28506.cpp:66:73: error: 'dfs1' was not declared in this scope
 void dfs2(int x,int f){size[x]=1;link(x)if(!v[j->t]&&j->t!=f)dfs1(j->t,x),size[x]+=size[j->t];}
                                                                         ^