View Compilation Error

0_0_19823834_17727.cpp: In function 'void dfs(int, int)':
0_0_19823834_17727.cpp:34:11: error: invalid types 'int[int]' for array subscript
     fa[now] = ffa;
           ^
0_0_19823834_17727.cpp:36:23: error: cannot convert 'node' to 'int' in initialization
     for (int i = a[now], i; i = a[i].next){
                       ^
0_0_19823834_17727.cpp:36:26: error: redeclaration of 'int i'
     for (int i = a[now], i; i = a[i].next){
                          ^
0_0_19823834_17727.cpp:36:14: note: 'int i' previously declared here
     for (int i = a[now], i; i = a[i].next){
              ^
0_0_19823834_17727.cpp:36:42: error: expected ';' before ')' token
     for (int i = a[now], i; i = a[i].next){
                                          ^