Arrays

Author: Shikha-code36

Arrays.ipynb

@@ -0,0 +1,153 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "id": "f17262c8",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "2\n"
+     ]
+    }
+   ],
+   "source": [
+    "#First index of element\n",
+    "def first_index(arr,x):\n",
+    "    res = -1\n",
+    "    for i in range(len(arr)):\n",
+    "        if arr[i]==x:\n",
+    "            res=i\n",
+    "            break\n",
+    "    return res\n",
+    "print(first_index([7,5,2,11,2,43,1,1],2))"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "id": "ba4b3c39",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "4\n"
+     ]
+    }
+   ],
+   "source": [
+    "#Last index of element\n",
+    "def last_index(arr,x):\n",
+    "    res = -1\n",
+    "    for i in range(len(arr)-1,-1,-1):\n",
+    "        if arr[i]==x:\n",
+    "            res=i\n",
+    "            break\n",
+    "    return res\n",
+    "print(last_index([7,5,2,11,2,43,1,1],2))"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "id": "08958bb9",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "[7, 5, 2, 11, 2, 43, 1, 10]\n"
+     ]
+    }
+   ],
+   "source": [
+    "#Reverse the array\n",
+    "def array_reverse(arr):\n",
+    "    return arr[::-1]\n",
+    "\n",
+    "print(array_reverse([10, 1, 43, 2 ,11, 2, 5 ,7]))"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "id": "622a1696",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "[2, 11, 2, 43, 1, 1, 7, 5]\n"
+     ]
+    }
+   ],
+   "source": [
+    "#Rotate array\n",
+    "def rotate_array(arr,k):\n",
+    "    res = arr[k:]+arr[:k]\n",
+    "    return res\n",
+    "\n",
+    "print(rotate_array([7, 5, 2 ,11 ,2 ,43, 1, 1],2))"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "id": "2c548fd9",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "(5, 12)\n"
+     ]
+    }
+   ],
+   "source": [
+    "#K'th smallest/largest element in an array\n",
+    "def kelement(arr,k):\n",
+    "    arr.sort()\n",
+    "    if len(arr)>=k:\n",
+    "        r1 = arr[k-1] #smallest\n",
+    "        r2 = arr[-k] #largest\n",
+    "        return r1,r2\n",
+    "\n",
+    "print(kelement([12, 3, 5, 7, 19],2))"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3.9.7 64-bit",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.9.7"
+  },
+  "vscode": {
+   "interpreter": {
+    "hash": "0d591c6e422414675974e227c13f5382000c440fedd3c5006ef2be5d887f0ba7"
+   }
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}