View Compilation Error

1_872_5511_26129.cpp: In function 'void dfs(int, int)':
1_872_5511_26129.cpp:12:17: error: 'sz' was not declared in this scope
     for (auto i:sz)
                 ^
1_872_5511_26129.cpp:14:17: error: 'y' was not declared in this scope
             dfs(y, s+1);
                 ^
1_872_5511_26129.cpp:16:35: error: 'y' was not declared in this scope
             loop.push_back(s-deep[y]+1);
                                   ^