View Compilation Error

0_0_27105035_30384.cpp: In function 'void dfs(int, int)':
0_0_27105035_30384.cpp:21:19: error: 'vet' was not declared in this scope
     for(int i=0;i<vet[root].size();i++){
                   ^
0_0_27105035_30384.cpp:27:39: error: 'n' was not declared in this scope
        all[root]+=all[son]+(sum[son]*(n-sum[son]))*(double)len;
                                       ^