View Compilation Error

0_0_38448969_17041.cpp: In function 'int main()':
0_0_38448969_17041.cpp:20:9: error: 'bitset' was not declared in this scope
         bitset<32> binary(dp[left]);
         ^
0_0_38448969_17041.cpp:20:35: error: 'binary' was not declared in this scope
         bitset<32> binary(dp[left]);
                                   ^