View Compilation Error

0_0_8681329_2739.cpp:5:41: ext/pb_ds/assoc_container.hpp: No such file or directory
0_0_8681329_2739.cpp:6:37: ext/pb_ds/tree_policy.hpp: No such file or directory
0_0_8681329_2739.cpp:8: error: expected namespace-name before ';' token
0_0_8681329_2739.cpp:8: error: `<type error>' is not a namespace
0_0_8681329_2739.cpp:12: error: expected init-declarator before '<' token
0_0_8681329_2739.cpp:12: error: expected `,' or `;' before '<' token