View Compilation Error

0_0_14274322_24567.cpp:10:1: error: 'queue' does not name a type
 queue< pii >q;
 ^
0_0_14274322_24567.cpp: In function 'void bfs(int, int)':
0_0_14274322_24567.cpp:16:12: error: 'q' was not declared in this scope
     while(!q.empty()) q.pop();
            ^
0_0_14274322_24567.cpp:17:5: error: 'q' was not declared in this scope
     q.push(pii(x,y));
     ^