View Compilation Error

0_0_15298078_21634.cpp: In function 'int main()':
0_0_15298078_21634.cpp:36:51: error: 'sort' was not declared in this scope
                 sort(num.begin(), num.end(), comp1);
                                                   ^
0_0_15298078_21634.cpp:37:82: error: 'equal_range' was not declared in this scope
                 it_p it=equal_range(num.begin(), num.end(), make_pair(y, 0),comp1);
                                                                                  ^
0_0_15298078_21634.cpp:42:51: error: 'sort' was not declared in this scope
                 sort(num.begin(), num.end(), comp2);
                                                   ^
0_0_15298078_21634.cpp:43:82: error: 'equal_range' was not declared in this scope
                 it_p it=equal_range(num.begin(), num.end(), make_pair(0, y),comp2);
                                                                                  ^