diff --git a/BINF2025_TP3.ipynb b/BINF2025_TP3.ipynb
index 61e87c2..8837da1 100644
--- a/BINF2025_TP3.ipynb
+++ b/BINF2025_TP3.ipynb
@@ -3,8 +3,7 @@
   "nbformat_minor": 0,
   "metadata": {
     "colab": {
-      "provenance": [],
-      "authorship_tag": "ABX9TyNSXnqaXAUgZK9rmJ1TWbGo"
+      "provenance": []
     },
     "kernelspec": {
       "name": "python3",
@@ -75,7 +74,15 @@
       "source": [
         "```markdown\n",
         "Votre réponse ici\n",
-        "```"
+        "```\n",
+        "\n",
+        "ATGTCATGA---TAC\n",
+        "AT--CTAAATGTTAC\n",
+        "\n",
+        "score = 1 + 1 - (0.5 * 2 + 0.5) + 1 - 1 - 1 - 1 + 1 - (0.5 * 3 + 0.5) + 1 + 1 + 1\n",
+        "      = 7 - 3 - 1.5 - 2\n",
+        "      = 4 - 3.5\n",
+        "      = 0.5"
       ],
       "metadata": {
         "id": "kCJGGGYQ2GNi"
@@ -101,6 +108,34 @@
         "id": "b9iovhyZ2bXw"
       }
     },
+    {
+      "cell_type": "markdown",
+      "source": [
+        "S =\n",
+        "\n",
+        "|       | 0̸    | A     | C     | T     | G     |\n",
+        "| :---: | :---: | :---: | :---: | :---: | :---: |\n",
+        "| **0̸**| 0     | 1     | 2     | 3     | 4     |\n",
+        "| **A** | 1     | 0     | 1     | 2     | 3     |\n",
+        "| **T** | 2     | 1     | 0     | 1     | 2     |\n",
+        "| **G** | 3     | 2     | 1     | 0     | 1     |\n",
+        "\n",
+        "B =\n",
+        "\n",
+        "|       | 0̸       | A          | C          | T          | G     |\n",
+        "| :---: | :---:    | :---:      | :---:      | :---:      | :---: |\n",
+        "| **0̸**| ***0̸*** | ←          | ←          | ←          | ←     |\n",
+        "| **A** | ⇑        | ***diag*** | ←          | ←          | ←     |\n",
+        "| **T** | ⇑        | ⇑          | ***diag*** | ←          | ←     |\n",
+        "| **G** | ⇑        | ⇑          | ⇑          | ***diag*** | **←** |\n",
+        "\n",
+        "\n",
+        "x : ATG_    et    y : ACTG"
+      ],
+      "metadata": {
+        "id": "SVjfrY_2DWGr"
+      }
+    },
     {
       "cell_type": "markdown",
       "source": [
@@ -132,6 +167,34 @@
         "id": "g_MrecVs3Nrw"
       }
     },
+    {
+      "cell_type": "markdown",
+      "source": [
+        "S =\n",
+        "\n",
+        "|       | 0̸    | A     | T     | G     | A     | C     |\n",
+        "| :---: | :---: | :---: | :---: | :---: | :---: | :---: |\n",
+        "| **0̸**| 0     | 0.5   | 1     | 1.5   | 2     | 2.5   |\n",
+        "| **T** | 0.5   | 1     | 1.5   | 2     | 2.5   | 3     |\n",
+        "| **A** | 1     | 1.5   | 2     | 2.5   | 3     | 3.5   |\n",
+        "| **T** | 1.5   | 2     | 2.5   | 3     | 3.5   | 4     |\n",
+        "\n",
+        "B =\n",
+        "\n",
+        "|       | 0̸       | A          | T          | G       | A       | C       |\n",
+        "| :---: | :---:    | :---:      | :---:      | :---:   | :---:   | :---:   |\n",
+        "| **0̸**| ***0̸*** | ←          | ←          | ←       | ←       | ←       |\n",
+        "| **T** | ***⇑***  | ←          | diag       | ←       | ←       | ←       |\n",
+        "| **A** | ⇑        | ***diag*** | ←          | ←       | diag    | ←       |\n",
+        "| **T** | ⇑        | ←          | ***diag*** | ***←*** | ***←*** | ***←*** |\n",
+        "\n",
+        "\n",
+        "x : TAT_ _ _    et    y : _ATGAC"
+      ],
+      "metadata": {
+        "id": "Obf_5k7kT0S_"
+      }
+    },
     {
       "cell_type": "markdown",
       "source": [
@@ -177,7 +240,18 @@
     {
       "cell_type": "code",
       "source": [
-        "#Votre code ici"
+        "def levenshtein(x, y):\n",
+        "  if x == '':\n",
+        "    return len(y)\n",
+        "  elif y == '':\n",
+        "    return len(x)\n",
+        "  elif x[0] is y[0]:\n",
+        "      return levenshtein(x[1:], y[1:])\n",
+        "  else:\n",
+        "    a = levenshtein(x[1:], y[1:])\n",
+        "    b = levenshtein(x[1:], y)\n",
+        "    c = levenshtein(x, y[1:])\n",
+        "    return 1 + min(a, b, c)"
       ],
       "metadata": {
         "id": "FJR69IEQ4aHv"
@@ -201,6 +275,31 @@
         "id": "arFVwA6E5NWn"
       }
     },
+    {
+      "cell_type": "code",
+      "source": [
+        "print(\"L(′CCAG′,′CA′) expected 2 got \", levenshtein('CCAG', 'CA'))\n",
+        "print(\"L(′CCGT′,′CGTCA′) expected 3 got \", levenshtein('CCGT', 'CGTCA'))"
+      ],
+      "metadata": {
+        "colab": {
+          "base_uri": "https://localhost:8080/"
+        },
+        "id": "4NN674KgF4Aq",
+        "outputId": "93324850-de18-424a-c98e-1e08c3250829"
+      },
+      "execution_count": null,
+      "outputs": [
+        {
+          "output_type": "stream",
+          "name": "stdout",
+          "text": [
+            "L(′CCAG′,′CA′) expected 2 got  2\n",
+            "L(′CCGT′,′CGTCA′) expected 3 got  3\n"
+          ]
+        }
+      ]
+    },
     {
       "cell_type": "markdown",
       "source": [