View Compilation Error

0_0_2344108_9795.cpp: In function `int bfs()':
0_0_2344108_9795.cpp:10: error: `queue' undeclared (first use this function)
0_0_2344108_9795.cpp:10: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2344108_9795.cpp:10: error: expected primary-expression before "int"
0_0_2344108_9795.cpp:10: error: expected `;' before "int"
0_0_2344108_9795.cpp:11: error: `q' undeclared (first use this function)