View Compilation Error

0_0_37717409_2151.cpp:8:1: error: 'bitset' does not name a type
 bitset<1050>dp[1050][1050];
 ^
0_0_37717409_2151.cpp: In function 'int main()':
0_0_37717409_2151.cpp:20:13: error: 'dp' was not declared in this scope
             dp[y][i-1]|=(1<<x);
             ^
0_0_37717409_2151.cpp:31:16: error: 'dp' was not declared in this scope
             if(dp[i][n][m]){
                ^