View Compilation Error

0_0_26395255_10758.cpp: In function 'int main()':
0_0_26395255_10758.cpp:123:21: error: 'bitset' was not declared in this scope
                     bitset<16> cur=i;
                     ^
0_0_26395255_10758.cpp:123:32: error: 'cur' was not declared in this scope
                     bitset<16> cur=i;
                                ^