View Compilation Error

0_0_6008512_5939.cpp: In function `int main()':
0_0_6008512_5939.cpp:7: error: `priority_queue' undeclared (first use this function)
0_0_6008512_5939.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6008512_5939.cpp:7: error: expected primary-expression before "int"
0_0_6008512_5939.cpp:7: error: expected `;' before "int"
0_0_6008512_5939.cpp:14: error: `q' undeclared (first use this function)