View Compilation Error

0_0_37718681_4720.cpp:8:1: error: 'bitset' does not name a type
 bitset<1050>dp[1050][2];
 ^
0_0_37718681_4720.cpp: In function 'int main()':
0_0_37718681_4720.cpp:18:13: error: 'dp' was not declared in this scope
             dp[i][0].reset();
             ^
0_0_37718681_4720.cpp:24:13: error: 'dp' was not declared in this scope
             dp[y][1]|=(1<<x);
             ^
0_0_37718681_4720.cpp:35:16: error: 'dp' was not declared in this scope
             if(dp[i][1][m]){
                ^