Finished Merge Sort

src/sorts.cpp

@@ -108,17 +108,50 @@ void Sorter::InsertionSort(void)
 
 void Sorter::MergeSort(void)
 {
-    ;
+    __MergeSort__(0, lineCount - 1);
+    return;
 }
 
-void Sorter::__MergeSort__(void)
+void Sorter::__MergeSort__(int p, int r)
 {
-    ;
+    if (p < r)
+    {
+        int q = (p + r) / 2;
+        __MergeSort__(p, q);
+        __MergeSort__(q+1, r);
+        __Merge__(p, q, r);
+    }
+    return;
 }
 
-void Sorter::__Merge__(void)
+void Sorter::__Merge__(int p, int q, int r)
 {
-    ;
+    int n1 = q - p + 1;
+    int n2 = r - q;
+    // L[i - 1] R[j - 1]
+    std::vector<std::string> leftTmp;
+    std::vector<std::string> rightTmp;
+    for (int i = 0; i < n1; i++)
+        leftTmp.push_back(newWordList[p + i]);
+    for (int i = 0; i < n2; i++)
+        rightTmp.push_back(newWordList[q + i + 1]);
+    leftTmp.push_back("ZZZZZ");
+    rightTmp.push_back("ZZZZZ");
+    int i = 0;
+    int j = 0;
+    for (int k = p; k <= r; k++)
+    {
+        if (leftTmp[i] <= rightTmp[j])
+        {
+            newWordList[k] = leftTmp[i];
+            i++;
+        }
+        else
+        {
+            newWordList[k] = rightTmp[j];
+            j++;
+        }
+    }
 }
 
 void Sorter::HeapSort(void)