View Compilation Error

0_0_8913820_17662.cpp:173:41: ext/pb_ds/assoc_container.hpp: No such file or directory
0_0_8913820_17662.cpp:174:37: ext/pb_ds/tree_policy.hpp: No such file or directory
0_0_8913820_17662.cpp:175:39: ext/pb_ds/tag_and_trait.hpp: No such file or directory
0_0_8913820_17662.cpp:177: error: `__gnu_pbds' has not been declared
0_0_8913820_17662.cpp:177: error: expected template-name before '<' token
0_0_8913820_17662.cpp:177: error: expected `{' before '<' token
0_0_8913820_17662.cpp:177: error: expected unqualified-id before '<' token
0_0_8913820_17662.cpp:177: error: expected `;' before '<' token