View Compilation Error

0_0_21979748_22388.cpp:23:1: error: 'bitset' does not name a type
 bitset<510> b[76],d;
 ^
0_0_21979748_22388.cpp: In function 'int main()':
0_0_21979748_22388.cpp:28:21: error: 'b' was not declared in this scope
         rep(i,0,76) b[i].reset();
                     ^
0_0_21979748_22388.cpp:37:24: error: 'b' was not declared in this scope
             rep(j,0,m) b[s1[j]-'0'].set(i);
                        ^
0_0_21979748_22388.cpp:39:9: error: 'd' was not declared in this scope
         d.reset();
         ^
0_0_21979748_22388.cpp:45:17: error: 'b' was not declared in this scope
             d=d&b[s[i]-'0'];
                 ^