View difference between Paste ID: HJ8rDBzp and W25gyqZ9

 #include <iostream>
 #include <vector>
 #include <iterator>
 #include <algorithm>
 #include <numeric>
 
 using namespace std;
 
 template <typename It>
 void PrintRange(It range_begin, It range_end) {
     for (auto it = range_begin; it != range_end; ++it) {
         cout << *it << " "s;
     }
     cout << endl;
 }
 
 template <typename RandomIt>
 void MergeSort(RandomIt range_begin, RandomIt range_end){
     if (next(range_begin) == range_end){
         return;
     }
     vector<typename RandomIt::value_type> elements(range_begin, range_end);
     auto middleof = elements.begin()+ (elements.size()/2);
     MergeSort(elements.begin(), middleof);
     MergeSort(middleof, elements.end());
 
     vector<typename RandomIt::value_type> v;
     merge(elements.begin(), middleof, middleof, elements.end(), back_inserter(v));
     swap_ranges(range_begin, range_end, begin(v));
 }
 
 int main() {
     vector<int> v = { 6, 4, 7, 6, 4, 4, 0, 1 };
     MergeSort(begin(v), end(v));
     for (int x : v) {
         cout << x << " ";
     }
     cout << endl;
     return 0;
 }