Help with this sorting vectors #include  using std::vector; using std::swap; // MergeSort(): sort the values in the data vector using a Merge Sort // data - vector to be sorted // first & last - first and last indices to be sorted // (makes it possible to sort a sub-vector) // cmp - function to compare a and b. cmp(a, b) returns // -/0/+ as a is less than/equal to/greater than b template  void MergeSort(vector& data, int first, int last, int (*cmp)(const T& a, const T& b)) { // Implement merge sort // May write separate Merge function, or include Merge code in MergeSort } // SelectionSort(): sort the values in the data vector using a Selection Sort // data - vector to be sorted // first & last - first and last indices to be sorted // (makes it possible to sort a sub-vector) // cmp - function to compare a and b. cmp(a, b) returns // -/0/+ as a is less than/equal to/greater than b template  void SelectionSort(vector& data, int first, int last, int (*cmp)(const T& a, const T& b)) { // Implement selection sort }