View Compilation Error

0_0_26049352_16579.cpp:4:8: error: 'N' was not declared in this scope
 bitset<N> bs[N];
        ^
0_0_26049352_16579.cpp:4:9: error: template argument 1 is invalid
 bitset<N> bs[N];
         ^
0_0_26049352_16579.cpp:4:14: error: 'N' was not declared in this scope
 bitset<N> bs[N];
              ^
0_0_26049352_16579.cpp:4:16: error: invalid type in declaration before ';' token
 bitset<N> bs[N];
                ^