diff --git a/README.md b/README.md
index a5d44fa54f420be5153b2ecdc64309ef2f9aa523..a487725871502ad175b78e6a43dc8a749f919ef5 100644
--- a/README.md
+++ b/README.md
@@ -18,11 +18,10 @@ Instructor: [Romain Vuillemot](romain.vuillemot@ec-lyon.fr)
 
 ## Course material
 
-- [lectures](https://gitlab.ec-lyon.fr/rvuillem/algo-bsc/-/tree/main/lectures): slides and code presented in class
+- [🏫 
+lectures](https://gitlab.ec-lyon.fr/rvuillem/algo-bsc/-/tree/main/lectures): slides and code presented in class and their [notebooks](https://gitlab.ec-lyon.fr/rvuillem/algo-bsc/-/tree/main/notebooks) with editable code
 
-- [notebooks](https://gitlab.ec-lyon.fr/rvuillem/algo-bsc/-/tree/main/notebooks): notebook of the lectures with editable code
-
-- [📝 exercises](https://gitlab.ec-lyon.fr/rvuillem/algo-bsc/-/tree/main/exercises): lab exercices and [solutions](https://gitlab.ec-lyon.fr/rvuillem/algo-bsc/-/tree/main/solutions)
+- [📝 labs](https://gitlab.ec-lyon.fr/rvuillem/algo-bsc/-/tree/main/labs): lab exercices and [solutions](https://gitlab.ec-lyon.fr/rvuillem/algo-bsc/-/tree/main/labs-solutions)
 
 - [📖 books](https://gitlab.ec-lyon.fr/rvuillem/algo-bsc/-/tree/main/books): books and ressources to prepare the lecture & learn more
 
diff --git a/exercises/.ipynb_checkpoints/01-data-structures-complexity-exercises-checkpoint.ipynb b/exercises/.ipynb_checkpoints/01-data-structures-complexity-exercises-checkpoint.ipynb
deleted file mode 100644
index eb87658d88cb93d1ccc8a931346c7a6bfeccfcba..0000000000000000000000000000000000000000
--- a/exercises/.ipynb_checkpoints/01-data-structures-complexity-exercises-checkpoint.ipynb
+++ /dev/null
@@ -1,253 +0,0 @@
-{
- "cells": [
-  {
-   "cell_type": "markdown",
-   "id": "a0b1f35b",
-   "metadata": {},
-   "source": [
-    "NAME:"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "a4e4fad3",
-   "metadata": {
-    "slideshow": {
-     "slide_type": "slide"
-    }
-   },
-   "source": [
-    "# Data Structures and Complexity"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "a8adef9b",
-   "metadata": {
-    "slideshow": {
-     "slide_type": "skip"
-    }
-   },
-   "source": [
-    "---"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "827ebb43-1e5d-4756-83ba-97af3e36b6af",
-   "metadata": {},
-   "source": [
-    "_For the following question, if a complexity is needed please pick one in this list_"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "b54157fc-f0d5-4689-bf2b-344a608bc5a9",
-   "metadata": {
-    "tags": []
-   },
-   "outputs": [],
-   "source": [
-    "list_complexities = [\"O(1)\", \"O(log(n))\", \"O(n)\", \"O(n^2)\", \"O(nlog(n))\", \"O(n^3)\", \"O(2^n)\", \"O(n!)\", \"O(n^n)\"]"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "568202fd",
-   "metadata": {
-    "slideshow": {
-     "slide_type": "subslide"
-    }
-   },
-   "source": [
-    "### Exercise 1: Identify the complexity of the following function"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "431fe8c1-91d1-40f3-a7a4-f4a3770a4a01",
-   "metadata": {
-    "tags": []
-   },
-   "outputs": [],
-   "source": [
-    "def nested_loop_example(L):\n",
-    "    n = len(L)\n",
-    "    for i in range(n):\n",
-    "        for j in range(n):\n",
-    "            print(L[i] + L[j])"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "e68b3e9a-418f-4950-9f27-18bb0fe90794",
-   "metadata": {
-    "deletable": false,
-    "nbgrader": {
-     "cell_type": "code",
-     "checksum": "1a3b054c6051bc0e03a25ef29d1c373b",
-     "grade": false,
-     "grade_id": "cell-a06bfe9af33fe998",
-     "locked": false,
-     "schema_version": 3,
-     "solution": true,
-     "task": false
-    },
-    "tags": []
-   },
-   "outputs": [],
-   "source": [
-    "# nested_loop_example_complexity = ?\n",
-    "# YOUR CODE HERE\n",
-    "raise NotImplementedError()"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "612dc873-419b-42c5-be36-0accd03ffa79",
-   "metadata": {},
-   "source": [
-    "### Exercise 2: Identify the complexity of the following function"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "76102853-e1f3-4717-8a59-1091195a19eb",
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "def fibonacci_recursive(n):\n",
-    "    if n <= 1:\n",
-    "        return n\n",
-    "    return fibonacci_recursive(n - 1) + fibonacci_recursive(n - 2)"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "dead6a52-7996-4eae-9d2a-f75d5d26bbb7",
-   "metadata": {
-    "deletable": false,
-    "nbgrader": {
-     "cell_type": "code",
-     "checksum": "1eadb247ef5c5224aa6800e2d7846174",
-     "grade": false,
-     "grade_id": "cell-34e130eb0c6b7e82",
-     "locked": false,
-     "schema_version": 3,
-     "solution": true,
-     "task": false
-    },
-    "tags": []
-   },
-   "outputs": [],
-   "source": [
-    "# fibonacci_recursive_complexity = ?\n",
-    "# YOUR CODE HERE\n",
-    "raise NotImplementedError()"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "aa4a6ce7-e542-4b23-8a10-ca0bf93de041",
-   "metadata": {},
-   "source": [
-    "### Exercise 3: Identify the complexity of the following function"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "70af3e43-8053-49c9-ba58-346a3e915bdb",
-   "metadata": {
-    "tags": []
-   },
-   "outputs": [],
-   "source": [
-    "def binary_search(L, target):\n",
-    "    low, high = 0, len(L) - 1\n",
-    "    while low <= high:\n",
-    "        mid = (low + high) // 2\n",
-    "        if L[mid] == target:\n",
-    "            return mid\n",
-    "        elif L[mid] < target:\n",
-    "            low = mid + 1\n",
-    "        else:\n",
-    "            high = mid - 1\n",
-    "    return -1"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "9c22866c-b4fc-4228-b0ab-5882d964f5f6",
-   "metadata": {
-    "deletable": false,
-    "nbgrader": {
-     "cell_type": "code",
-     "checksum": "5f3471162e0167bb6022ece5eed0a4f7",
-     "grade": false,
-     "grade_id": "cell-ea8595a5923fbb0e",
-     "locked": false,
-     "schema_version": 3,
-     "solution": true,
-     "task": false
-    },
-    "tags": []
-   },
-   "outputs": [],
-   "source": [
-    "# binary_searche_complexity = ?\n",
-    "# YOUR CODE HERE\n",
-    "raise NotImplementedError()"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "87b4921b-ef55-4083-b4f1-a3ca5bb7b011",
-   "metadata": {},
-   "source": [
-    "### Additional checks (do not change)"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "6e8f2878-ce5f-4cd8-a5a5-7bce8f655ab8",
-   "metadata": {
-    "tags": []
-   },
-   "outputs": [],
-   "source": [
-    "assert nested_loop_example_complexity in list_complexities\n",
-    "assert fibonacci_recursive_complexity in list_complexities\n",
-    "assert binary_searche_complexity in list_complexities"
-   ]
-  }
- ],
- "metadata": {
-  "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
-   "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": "3.10.9"
-  }
- },
- "nbformat": 4,
- "nbformat_minor": 5
-}
diff --git a/solutions/01-data-structures-complexity-exercises.ipynb b/labs-solutions/01-data-structures-complexity-exercises.ipynb
similarity index 83%
rename from solutions/01-data-structures-complexity-exercises.ipynb
rename to labs-solutions/01-data-structures-complexity-exercises.ipynb
index 9efd413610e3c5c73ec68aad10753225da3d07d6..7a597a5fad7156f6e5f10b9e53696c8f6a0eade9 100644
--- a/solutions/01-data-structures-complexity-exercises.ipynb
+++ b/labs-solutions/01-data-structures-complexity-exercises.ipynb
@@ -798,7 +798,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 248,
+   "execution_count": 276,
    "id": "0cff0f05-4205-43ae-9a3d-eea4a052faee",
    "metadata": {
     "nbgrader": {
@@ -828,7 +828,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 249,
+   "execution_count": 277,
    "id": "a767d813-b0d8-4181-83a8-69ac322812a3",
    "metadata": {
     "tags": []
@@ -840,7 +840,7 @@
        "(True, (0, 1))"
       ]
      },
-     "execution_count": 249,
+     "execution_count": 277,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -852,7 +852,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 250,
+   "execution_count": 278,
    "id": "444a52cd-c79e-4c58-962d-e1ce715e19d0",
    "metadata": {
     "nbgrader": {
@@ -870,17 +870,199 @@
     "# Write tests and complexity\n",
     "### BEGIN SOLUTION\n",
     "assert two_average([1, 1, 1], 1) == (True, (0, 1))\n",
+    "### END SOLUTION"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "289cea39-c225-47c9-84fc-a526ea979525",
+   "metadata": {},
+   "source": [
+    "## Exercise 9\n",
     "\n",
+    "Given a positive integer (e.g. `123` of type `int`), return the number of digits it contains (e.g. for `123` the solution is `3`, or for `56` the solution is `2`)."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 281,
+   "id": "624490e3-3e5c-4b2f-899f-00808f221f21",
+   "metadata": {
+    "nbgrader": {
+     "grade": false,
+     "grade_id": "cell-e200fed0b8ebe2b1",
+     "locked": false,
+     "schema_version": 3,
+     "solution": true,
+     "task": false
+    },
+    "tags": []
+   },
+   "outputs": [],
+   "source": [
+    "# Write your code here\n",
+    "### BEGIN SOLUTION\n",
+    "def number_of_digits(x):\n",
+    "  digits = 1\n",
+    "  while x//10 != 0:\n",
+    "    digits += 1\n",
+    "    x = x//10\n",
+    "  return digits\n",
     "### END SOLUTION"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
-   "id": "d7856b0d-f532-46d1-8ef8-139771b16a99",
-   "metadata": {},
+   "execution_count": 282,
+   "id": "b5c751f1-7479-4dac-8991-c95e94cf873e",
+   "metadata": {
+    "nbgrader": {
+     "grade": false,
+     "grade_id": "cell-20f4e37317993d39",
+     "locked": false,
+     "schema_version": 3,
+     "solution": true,
+     "task": false
+    },
+    "tags": []
+   },
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "3"
+      ]
+     },
+     "execution_count": 282,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "# Example of use\n",
+    "number_of_digits(123) # 3"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 283,
+   "id": "e1c89113-e8b1-4940-a46b-203cfa5e2d46",
+   "metadata": {
+    "nbgrader": {
+     "grade": false,
+     "grade_id": "cell-2ace6e0c3b7b5b36",
+     "locked": false,
+     "schema_version": 3,
+     "solution": true,
+     "task": false
+    },
+    "tags": []
+   },
    "outputs": [],
-   "source": []
+   "source": [
+    "# Write tests and complexity\n",
+    "### BEGIN SOLUTION\n",
+    "assert number_of_digits(3) == 1\n",
+    "### END SOLUTION"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "4eea1a02-389b-4b81-8584-e382447e3c8b",
+   "metadata": {
+    "tags": []
+   },
+   "source": [
+    "## Exercise 10\n",
+    "\n",
+    "_Find the duplicates in a list L._"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 300,
+   "id": "e9d8e436-3d1e-4621-ac61-2bc721615e16",
+   "metadata": {
+    "nbgrader": {
+     "grade": false,
+     "grade_id": "cell-e151224f47db9c8b",
+     "locked": false,
+     "schema_version": 3,
+     "solution": true,
+     "task": false
+    },
+    "tags": []
+   },
+   "outputs": [],
+   "source": [
+    "# Write your code here\n",
+    "### BEGIN SOLUTION\n",
+    "def find_duplicates(L):\n",
+    "    c = {}\n",
+    "    duplicates = []\n",
+    "    \n",
+    "    for item in L:\n",
+    "        if item in c:\n",
+    "            c[item] += 1\n",
+    "        else:\n",
+    "            c[item] = 1\n",
+    "    \n",
+    "    # Find elements that occur more than once\n",
+    "    for item, count in c.items():\n",
+    "        if count > 1:\n",
+    "            duplicates.append(item)\n",
+    "    \n",
+    "    return duplicates\n",
+    "### END SOLUTION"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 301,
+   "id": "1dc59ab4-648a-4c5f-ab63-f208b70e21e7",
+   "metadata": {
+    "tags": []
+   },
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "[]"
+      ]
+     },
+     "execution_count": 301,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "# Example of use\n",
+    "find_duplicates([1, 2]) # []"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 299,
+   "id": "394770a0-0548-450e-a0cc-db3f49d648f5",
+   "metadata": {
+    "nbgrader": {
+     "grade": false,
+     "grade_id": "cell-0317a507de8850f1",
+     "locked": false,
+     "schema_version": 3,
+     "solution": true,
+     "task": false
+    },
+    "tags": []
+   },
+   "outputs": [],
+   "source": [
+    "# Write tests and complexity\n",
+    "### BEGIN SOLUTION\n",
+    "assert find_duplicates([1, 2]) == []\n",
+    "assert find_duplicates([1, 2, 1]) == [1]\n",
+    "### END SOLUTION"
+   ]
   }
  ],
  "metadata": {
diff --git a/exercises/01-data-structures-complexity-exercises.ipynb b/labs/01-data-structures-complexity-exercises.ipynb
similarity index 84%
rename from exercises/01-data-structures-complexity-exercises.ipynb
rename to labs/01-data-structures-complexity-exercises.ipynb
index c317c455d794219f95885a427ec03a2c5db5b0dd..8a626dab580296e3697739835da2056f659a9898 100644
--- a/exercises/01-data-structures-complexity-exercises.ipynb
+++ b/labs/01-data-structures-complexity-exercises.ipynb
@@ -2,7 +2,7 @@
  "cells": [
   {
    "cell_type": "markdown",
-   "id": "7f1dc218",
+   "id": "a263557d",
    "metadata": {},
    "source": [
     "NAME:"
@@ -778,13 +778,164 @@
     "raise NotImplementedError()"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "id": "289cea39-c225-47c9-84fc-a526ea979525",
+   "metadata": {},
+   "source": [
+    "## Exercise 9\n",
+    "\n",
+    "Given a positive integer (e.g. `123` of type `int`), return the number of digits it contains (e.g. for `123` the solution is `3`, or for `56` the solution is `2`)."
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,
-   "id": "d7856b0d-f532-46d1-8ef8-139771b16a99",
-   "metadata": {},
+   "id": "624490e3-3e5c-4b2f-899f-00808f221f21",
+   "metadata": {
+    "deletable": false,
+    "nbgrader": {
+     "cell_type": "code",
+     "checksum": "55453fc83bd2c986de0dda489b3486e3",
+     "grade": false,
+     "grade_id": "cell-e200fed0b8ebe2b1",
+     "locked": false,
+     "schema_version": 3,
+     "solution": true,
+     "task": false
+    },
+    "tags": []
+   },
+   "outputs": [],
+   "source": [
+    "# Write your code here\n",
+    "# YOUR CODE HERE\n",
+    "raise NotImplementedError()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "b5c751f1-7479-4dac-8991-c95e94cf873e",
+   "metadata": {
+    "deletable": false,
+    "nbgrader": {
+     "cell_type": "code",
+     "checksum": "90543087d1b637ae6dd6e55e33741b52",
+     "grade": false,
+     "grade_id": "cell-20f4e37317993d39",
+     "locked": false,
+     "schema_version": 3,
+     "solution": true,
+     "task": false
+    },
+    "tags": []
+   },
+   "outputs": [],
+   "source": [
+    "# YOUR CODE HERE\n",
+    "raise NotImplementedError()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "e1c89113-e8b1-4940-a46b-203cfa5e2d46",
+   "metadata": {
+    "deletable": false,
+    "nbgrader": {
+     "cell_type": "code",
+     "checksum": "2bda07ac948d7cce7aa67753fc1ea514",
+     "grade": false,
+     "grade_id": "cell-2ace6e0c3b7b5b36",
+     "locked": false,
+     "schema_version": 3,
+     "solution": true,
+     "task": false
+    },
+    "tags": []
+   },
+   "outputs": [],
+   "source": [
+    "# Write tests and complexity\n",
+    "# YOUR CODE HERE\n",
+    "raise NotImplementedError()"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "4eea1a02-389b-4b81-8584-e382447e3c8b",
+   "metadata": {
+    "tags": []
+   },
+   "source": [
+    "## Exercise 10\n",
+    "\n",
+    "_Find the duplicates in a list L._"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "e9d8e436-3d1e-4621-ac61-2bc721615e16",
+   "metadata": {
+    "deletable": false,
+    "nbgrader": {
+     "cell_type": "code",
+     "checksum": "0b0c4d2d1ec36ead4801af1fee712caf",
+     "grade": false,
+     "grade_id": "cell-e151224f47db9c8b",
+     "locked": false,
+     "schema_version": 3,
+     "solution": true,
+     "task": false
+    },
+    "tags": []
+   },
+   "outputs": [],
+   "source": [
+    "# Write your code here\n",
+    "# YOUR CODE HERE\n",
+    "raise NotImplementedError()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "1dc59ab4-648a-4c5f-ab63-f208b70e21e7",
+   "metadata": {
+    "tags": []
+   },
    "outputs": [],
-   "source": []
+   "source": [
+    "# Example of use\n",
+    "find_duplicates([1, 2]) # []"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "394770a0-0548-450e-a0cc-db3f49d648f5",
+   "metadata": {
+    "deletable": false,
+    "nbgrader": {
+     "cell_type": "code",
+     "checksum": "155c3d4e85d43c4fb11851be14064fee",
+     "grade": false,
+     "grade_id": "cell-0317a507de8850f1",
+     "locked": false,
+     "schema_version": 3,
+     "solution": true,
+     "task": false
+    },
+    "tags": []
+   },
+   "outputs": [],
+   "source": [
+    "# Write tests and complexity\n",
+    "# YOUR CODE HERE\n",
+    "raise NotImplementedError()"
+   ]
   }
  ],
  "metadata": {
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