View Compilation Error

0_0_19458623_18259.cpp: In function 'int main()':
0_0_19458623_18259.cpp:12:3: error: 'priority_queue' was not declared in this scope
   priority_queue<node>s;
   ^
0_0_19458623_18259.cpp:12:22: error: expected primary-expression before '>' token
   priority_queue<node>s;
                      ^
0_0_19458623_18259.cpp:12:23: error: 's' was not declared in this scope
   priority_queue<node>s;
                       ^