View Compilation Error

0_0_17465906_27971.cpp: In function 'void Tarjan(int)':
0_0_17465906_27971.cpp:69:21: error: 'dep' was not declared in this scope
     dfn[u]=low[u]=++dep;
                     ^
0_0_17465906_27971.cpp:71:5: error: 'vis' was not declared in this scope
     vis[u]=1;
     ^
0_0_17465906_27971.cpp:83:9: error: 'atype' was not declared in this scope
         atype++;
         ^