add hash table collision handling using linear probing

Author: grasshopper787

data_structures/4_HashTable_2_Collisions/Solutions.ipynb

@@ -462,13 +462,11 @@
    ]
   },
   {
-   "cell_type": "code",
-   "execution_count": 36,
-   "id": "38abc1ec-d1c5-4002-ac83-ca9dd318433d",
+   "cell_type": "markdown",
+   "id": "30ac3e92-b786-4954-9db4-bdd786c28822",
    "metadata": {},
-   "outputs": [],
    "source": [
-    "#Implement hash table collision handling using linear probing"
+    "# Implement hash table collision handling using linear probing"
    ]
   },
   {
@@ -681,11 +679,208 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 85,
    "id": "bddee77e-9c11-47f6-aa9f-a344a61305d7",
    "metadata": {},
    "outputs": [],
-   "source": []
+   "source": [
+    "class HashTableLP:\n",
+    "    def __init__(self, num_of_rows):\n",
+    "        self.num_of_rows = num_of_rows\n",
+    "        self.arr = [None for _ in range(self.num_of_rows)]\n",
+    "    \n",
+    "    def get_hash(self, key):\n",
+    "        sum_h = 0\n",
+    "        for el in key:\n",
+    "            sum_h += ord(el)\n",
+    "        mod = sum_h % self.num_of_rows\n",
+    "        return mod  \n",
+    "    \n",
+    "    def __getitem__(self, key):\n",
+    "        h = self.get_hash(key)\n",
+    "        if self.arr[h][0] == key:\n",
+    "            return self.arr[h][1]\n",
+    "        else:\n",
+    "            while self.arr[h][0] != key:\n",
+    "                h += 1\n",
+    "                h %= self.num_of_rows\n",
+    "            return self.arr[h][1] \n",
+    "                \n",
+    "    def __setitem__(self, key, value):\n",
+    "        h = self.get_hash(key)\n",
+    "        if self.arr[h] is None:\n",
+    "            self.arr[h] = (key, value)\n",
+    "        else:\n",
+    "            while self.arr[h] is not None:\n",
+    "                h += 1\n",
+    "                h %= self.num_of_rows\n",
+    "            self.arr[h] = (key, value)           \n",
+    "        \n",
+    "    def __delitem__(self, key):\n",
+    "        h = self.get_hash(key)\n",
+    "        if self.arr[h][0] == key:\n",
+    "            del self.arr[h]\n",
+    "        else:\n",
+    "            while self.arr[h][0] != key:\n",
+    "                h += 1\n",
+    "                h %= self.num_of_rows\n",
+    "            del self.arr[h]"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 86,
+   "id": "48dc4747-5393-480d-9d70-ae0f0ea0b6ae",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "htlp = HashTableLP(10)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 87,
+   "id": "8d04333a-3c8b-474c-b2e9-6cf7955eb263",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "htlp[\"march 6\"] = 120\n",
+    "htlp[\"march 8\"] = 67\n",
+    "htlp[\"march 9\"] = 4\n",
+    "htlp[\"march 17\"] = 459"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 89,
+   "id": "95b5f8f7-36ef-479e-82db-f5befcea4933",
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "9"
+      ]
+     },
+     "execution_count": 89,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "htlp.get_hash(\"march 6\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 90,
+   "id": "cc705fae-bcf6-4908-b686-639baa43e098",
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "9"
+      ]
+     },
+     "execution_count": 90,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "htlp.get_hash(\"march 17\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 88,
+   "id": "f92b0165-f200-4f1f-bd2d-0750595e1206",
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "[('march 17', 459),\n",
+       " ('march 8', 67),\n",
+       " ('march 9', 4),\n",
+       " None,\n",
+       " None,\n",
+       " None,\n",
+       " None,\n",
+       " None,\n",
+       " None,\n",
+       " ('march 6', 120)]"
+      ]
+     },
+     "execution_count": 88,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "htlp.arr"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 92,
+   "id": "e11ed292-8a92-44f9-899c-a9b670653849",
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "4"
+      ]
+     },
+     "execution_count": 92,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "htlp[\"march 9\"]"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 93,
+   "id": "57ab0444-dd72-4964-b60c-e833190f3733",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "del htlp[\"march 8\"]"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 94,
+   "id": "6d3d67c4-536a-47aa-854f-45235b67ea67",
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "[('march 17', 459),\n",
+       " ('march 9', 4),\n",
+       " None,\n",
+       " None,\n",
+       " None,\n",
+       " None,\n",
+       " None,\n",
+       " None,\n",
+       " ('march 6', 120)]"
+      ]
+     },
+     "execution_count": 94,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "htlp.arr"
+   ]
   }
  ],
  "metadata": {