View Compilation Error

0_0_34291901_19918.cpp:21:6: error: 'bitset' in namespace 'std' does not name a template type
 std::bitset<N>S[10],ans;
      ^
0_0_34291901_19918.cpp: In function 'int main()':
0_0_34291901_19918.cpp:28:40: error: 'S' was not declared in this scope
   for(int j=1;j<=m;j++) scanf("%d",&a),S[a][i]=1;
                                        ^
0_0_34291901_19918.cpp:33:3: error: 'ans' was not declared in this scope
   ans<<=1,ans[1]=1,ans&=S[s[i]-48];
   ^
0_0_34291901_19918.cpp:33:25: error: 'S' was not declared in this scope
   ans<<=1,ans[1]=1,ans&=S[s[i]-48];
                         ^