View Compilation Error

0_0_35786042_1824.cpp: In function 'void bfs()':
0_0_35786042_1824.cpp:62:5: error: 'queue' was not declared in this scope
     queue<int> q;
     ^
0_0_35786042_1824.cpp:62:14: error: expected primary-expression before '>' token
     queue<int> q;
              ^
0_0_35786042_1824.cpp:62:16: error: 'q' was not declared in this scope
     queue<int> q;
                ^