View Compilation Error

0_0_26575422_21214.cpp: In function 'void dfs2(int, int)':
0_0_26575422_21214.cpp:87:15: error: 'id' was not declared in this scope
  top[x] = tp; id[x] = ++cnt; rk[cnt] = x;
               ^
0_0_26575422_21214.cpp:87:30: error: 'rk' was not declared in this scope
  top[x] = tp; id[x] = ++cnt; rk[cnt] = x;
                              ^