View Compilation Error

0_0_17022462_29430.cpp:5:1: error: 'usingnamespace' does not name a type
 usingnamespace std;
 ^
0_0_17022462_29430.cpp:29:1: error: 'bitset' does not name a type
 bitset<5000000> vis;
 ^
0_0_17022462_29430.cpp: In function 'int bfs()':
0_0_17022462_29430.cpp:32:5: error: 'vis' was not declared in this scope
     vis.reset();
     ^
0_0_17022462_29430.cpp:35:5: error: 'queue' was not declared in this scope
     queue<S> que;
     ^
0_0_17022462_29430.cpp:35:5: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/queue:64:0,
                 from 0_0_17022462_29430.cpp:4:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_queue.h:96:11: note:   'std::queue'
     class queue
           ^
0_0_17022462_29430.cpp:35:12: error: expected primary-expression before '>' token
     queue<S> que;
            ^
0_0_17022462_29430.cpp:35:14: error: 'que' was not declared in this scope
     queue<S> que;
              ^