View Compilation Error

0_0_37721160_6341.cpp:9:1: error: 'bitset' does not name a type
 bitset<N> dp[2][3],w[26];
 ^
0_0_37721160_6341.cpp: In function 'int main()':
0_0_37721160_6341.cpp:20:16: error: 'dp' was not declared in this scope
         memset(dp,0,sizeof dp);
                ^
0_0_37721160_6341.cpp:21:16: error: 'w' was not declared in this scope
         memset(w,0,sizeof w);
                ^