View Compilation Error

0_0_20059691_23538.cpp: In function 'void dfs(int)':
0_0_20059691_23538.cpp:32:2: error: expected initializer before 'bool'
  bool ok=0;
  ^
0_0_20059691_23538.cpp:34:3: error: 'tid' was not declared in this scope
   tid[i]=id[i];
   ^
0_0_20059691_23538.cpp:37:3: error: 'ok' was not declared in this scope
   ok=0;
   ^
0_0_20059691_23538.cpp:48:11: error: 'tid' was not declared in this scope
     id[j]=tid[j];
           ^