View Compilation Error

0_0_4409263_24217.cpp:4:40: ext/pb_ds/priority_queue.hpp: No such file or directory
0_0_4409263_24217.cpp:7: error: `__gnu_pbds' has not been declared
0_0_4409263_24217.cpp: In function `int main()':
0_0_4409263_24217.cpp:15: error: 'class std::priority_queue<int, std::vector<int, std::allocator<int> >, std::less<int> >' has no member named 'clear'