Merge Sort

Author: soumyadip007

Sorting/InsertionSort-Copy1.ipynb

@@ -0,0 +1,70 @@
+{
+ "cells": [
+  {
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+   "metadata": {},
+   "source": [
+    "def merge_sort(alist, start, end):\n",
+    "    '''Sorts the list from indexes start to end - 1 inclusive.'''\n",
+    "    if end - start > 1:\n",
+    "        mid = (start + end)//2\n",
+    "        merge_sort(alist, start, mid)\n",
+    "        merge_sort(alist, mid, end)\n",
+    "        merge_list(alist, start, mid, end)\n",
+    " \n",
+    "def merge_list(alist, start, mid, end):\n",
+    "    left = alist[start:mid]\n",
+    "    right = alist[mid:end]\n",
+    "    k = start\n",
+    "    i = 0\n",
+    "    j = 0\n",
+    "    while (start + i < mid and mid + j < end):\n",
+    "        if (left[i] <= right[j]):\n",
+    "            alist[k] = left[i]\n",
+    "            i = i + 1\n",
+    "        else:\n",
+    "            alist[k] = right[j]\n",
+    "            j = j + 1\n",
+    "        k = k + 1\n",
+    "    if start + i < mid:\n",
+    "        while k < end:\n",
+    "            alist[k] = left[i]\n",
+    "            i = i + 1\n",
+    "            k = k + 1\n",
+    "    else:\n",
+    "        while k < end:\n",
+    "            alist[k] = right[j]\n",
+    "            j = j + 1\n",
+    "            k = k + 1\n",
+    " \n",
+    " \n",
+    "alist = input('Enter the list of numbers: ').split()\n",
+    "alist = [int(x) for x in alist]\n",
+    "merge_sort(alist, 0, len(alist))\n",
+    "print('Sorted list: ', end='')\n",
+    "print(alist)"
+   ]
+  }
+ ],
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