View Compilation Error

0_0_18293851_8346.cpp:50:1: error: 'bitset' does not name a type
 bitset<90> dp[11];
 ^
0_0_18293851_8346.cpp: In function 'bool check(int, int, int)':
0_0_18293851_8346.cpp:54:3: error: 'dp' was not declared in this scope
   dp[i].reset();
   ^
0_0_18293851_8346.cpp:55:2: error: 'dp' was not declared in this scope
  dp[0][0] = 1;
  ^