diff --git a/task1/main.cpp b/task1/main.cpp
index 7b770d7..a2fdad9 100644
--- a/task1/main.cpp
+++ b/task1/main.cpp
@@ -67,6 +67,13 @@ auto main(int argc, char *argv[]) -> int {
         //const int max_depth = std::thread::hardware_concurrency();
         const int max_depth = 4;
         t1 = std::chrono::high_resolution_clock::now();
+        MergeSorterMT<int, bool(*)(int, int)> ms([](int a, int b) {
+            return (a>b);
+        });
+        std::span t = dataset_par;
+        int mdepth = 4;
+        std::recursive_mutex mut;
+        ms.split(t, 0, mdepth, mut);
         algo::MergeSort_mt::sort(dataset_par, [](int32_t a, int32_t b) {
             return (a > b);
         }, max_depth);
diff --git a/task1/mergesort_mt.h b/task1/mergesort_mt.h
index 51fc7a1..f88ff4b 100644
--- a/task1/mergesort_mt.h
+++ b/task1/mergesort_mt.h
@@ -6,7 +6,11 @@
 template<typename T, typename C>
 class MergeSorterMT {
 
-    C comp;
+public:
+    MergeSorterMT(C cmp) : cmp(cmp){}
+
+
+    C cmp;
     std::recursive_mutex mut;
 
     auto merge(std::span<T> &output, std::span<T> left, std::span<T> right) -> void {
@@ -44,8 +48,29 @@ class MergeSorterMT {
         }
     }
 
-    auto split(std::vector<T> &data, C cmp, int depth, int &max_depth, std::mutex &mut) -> void {
+    auto split(std::span<T> &data, int depth, int &max_depth, std::recursive_mutex &mut) -> void {
+        if(std::distance(data.begin(), data.end()) <= 1) {
+            return;
+        }
 
+        auto mid = data.begin();
+        std::advance(mid, std::distance(data.begin(), data.end())/2);
+
+        std::span<T> left(data.begin(), mid);
+        std::span<T> right(mid, data.end());
+
+        if(depth < max_depth) {
+            std::thread left_thread(&MergeSorterMT<T, C>::split, this, left, depth + 1, max_depth, mut);
+            std::thread right_thread(&MergeSorterMT<T, C>::split, this, right, depth + 1, max_depth, mut);
+
+            left_thread.join();
+            right_thread.join();
+        } else {
+            split(left, depth + 1, max_depth, mut);
+            split(right, depth + 1, max_depth, mut);
+        }
+
+        merge(data, left, right);
     }