View Compilation Error

0_0_33758405_3795.cpp: In function 'void dfs(int)':
0_0_33758405_3795.cpp:32:8: error: 'vis' was not declared in this scope
    if (vis[q[i].a[j]]==0) 
        ^
0_0_33758405_3795.cpp: In function 'int main()':
0_0_33758405_3795.cpp:84:9: error: 'vis' was not declared in this scope
     if (vis[j]==1) continue;
         ^