View Compilation Error

0_0_33823490_23057.cpp: In function 'int main()':
0_0_33823490_23057.cpp:33:21: error: 'q' was not declared in this scope
             while (!q.empty()) {
                     ^
0_0_33823490_23057.cpp:39:13: error: 'q' was not declared in this scope
             q.push_back(i);
             ^
0_0_33823490_23057.cpp:42:22: error: 'q' was not declared in this scope
         for (int x : q) {
                      ^