diff --git a/d04/.ipynb_checkpoints/d04-checkpoint.ipynb b/d04/.ipynb_checkpoints/d04-checkpoint.ipynb
new file mode 100644
index 0000000..7fc15ad
--- /dev/null
+++ b/d04/.ipynb_checkpoints/d04-checkpoint.ipynb
@@ -0,0 +1,228 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "id": "e4d43863",
+   "metadata": {},
+   "source": [
+    "# setup"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 12,
+   "id": "f81b055e",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "sample = \"\"\"7,4,9,5,11,17,23,2,0,14,21,24,10,16,13,6,15,25,12,22,18,20,8,19,3,26,1\n",
+    "\n",
+    "22 13 17 11  0\n",
+    " 8  2 23  4 24\n",
+    "21  9 14 16  7\n",
+    " 6 10  3 18  5\n",
+    " 1 12 20 15 19\n",
+    "\n",
+    " 3 15  0  2 22\n",
+    " 9 18 13 17  5\n",
+    "19  8  7 25 23\n",
+    "20 11 10 24  4\n",
+    "14 21 16 12  6\n",
+    "\n",
+    "14 21 17 24  4\n",
+    "10 16 15  9 19\n",
+    "18  8 23 26 20\n",
+    "22 11 13  6  5\n",
+    " 2  0 12  3  7\"\"\""
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 13,
+   "id": "61075998",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "input = open(\"input\",\"rt\").read()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 14,
+   "id": "e8a71b8a",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "splinput = input.split(\"\\n\\n\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 15,
+   "id": "fd29a42b",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "numbers = list(map(int, splinput[0].split(',')))"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 16,
+   "id": "1a0fb4f1",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "grids = []\n",
+    "ingrids = [l.splitlines() for l in splinput[1:]]\n",
+    "for grid in ingrids:\n",
+    "    rows = []\n",
+    "    for row in grid:\n",
+    "        rows.append(list(map(lambda x: (int(x), False),row.strip().replace('  ',' ').split(' '))))\n",
+    "    grids.append(rows)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "2891f090",
+   "metadata": {},
+   "source": [
+    "# commons"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 17,
+   "id": "a460886c",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def mark(ingrids, number):\n",
+    "    grids = []\n",
+    "    for grid in ingrids:\n",
+    "        rows = []\n",
+    "        for row in grid:\n",
+    "            rows.append(list(map(lambda x: (x[0], x[1] or x[0]==number), row)))\n",
+    "        grids.append(rows)\n",
+    "    return grids\n",
+    "\n",
+    "def atleast1_row_completed(grid):\n",
+    "    for row in grid:\n",
+    "        if all(map(lambda x: x[1], row)):\n",
+    "            return True\n",
+    "    return False\n",
+    "\n",
+    "def wining_grid(grid):\n",
+    "    return atleast1_row_completed(grid) or atleast1_row_completed(list(map(list,zip(*grid))))\n",
+    "\n",
+    "from itertools import chain\n",
+    "\n",
+    "def sum_unmarked(grid):\n",
+    "    return sum(map(lambda x: x[0], filter(lambda x: not x[1], list(chain(*grid)))))"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "504cbf6d",
+   "metadata": {},
+   "source": [
+    "# part 1"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 18,
+   "id": "e18c276b",
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "74320"
+      ]
+     },
+     "execution_count": 18,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "def run_1(grids, numbers):\n",
+    "    for number in numbers:\n",
+    "        grids = mark(grids, number)\n",
+    "        for grid in grids:\n",
+    "            if wining_grid(grid):\n",
+    "                return number *sum_unmarked(grid)               \n",
+    "\n",
+    "run_1(grids, numbers)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "48f45375",
+   "metadata": {},
+   "source": [
+    "# part 2"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 19,
+   "id": "61f6c035",
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "17884"
+      ]
+     },
+     "execution_count": 19,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "def run_2(grids, numbers):\n",
+    "    for (i, number) in enumerate(numbers):\n",
+    "        grids = mark(grids, number)\n",
+    "        # stop if all grid are winning except one\n",
+    "        loosing_grids = list(filter(lambda g: not wining_grid(g), grids))\n",
+    "        if len(loosing_grids) == 1:\n",
+    "            lg = loosing_grids[0]\n",
+    "            return run_1([lg], numbers[i+1:])\n",
+    "\n",
+    "run_2(grids, numbers)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "128cac38",
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "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": "3.9.2"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}
diff --git a/d04/d04.ipynb b/d04/d04.ipynb
new file mode 100644
index 0000000..aac8dc4
--- /dev/null
+++ b/d04/d04.ipynb
@@ -0,0 +1,228 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "id": "e4d43863",
+   "metadata": {},
+   "source": [
+    "# setup"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 21,
+   "id": "f81b055e",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "sample = \"\"\"7,4,9,5,11,17,23,2,0,14,21,24,10,16,13,6,15,25,12,22,18,20,8,19,3,26,1\n",
+    "\n",
+    "22 13 17 11  0\n",
+    " 8  2 23  4 24\n",
+    "21  9 14 16  7\n",
+    " 6 10  3 18  5\n",
+    " 1 12 20 15 19\n",
+    "\n",
+    " 3 15  0  2 22\n",
+    " 9 18 13 17  5\n",
+    "19  8  7 25 23\n",
+    "20 11 10 24  4\n",
+    "14 21 16 12  6\n",
+    "\n",
+    "14 21 17 24  4\n",
+    "10 16 15  9 19\n",
+    "18  8 23 26 20\n",
+    "22 11 13  6  5\n",
+    " 2  0 12  3  7\"\"\""
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 22,
+   "id": "9bda4c17",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "input = open(\"input\",\"rt\").read()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 23,
+   "id": "e8a71b8a",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "splinput = input.split(\"\\n\\n\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 24,
+   "id": "fd29a42b",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "numbers = list(map(int, splinput[0].split(',')))"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 25,
+   "id": "1a0fb4f1",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "grids = []\n",
+    "ingrids = [l.splitlines() for l in splinput[1:]]\n",
+    "for grid in ingrids:\n",
+    "    rows = []\n",
+    "    for row in grid:\n",
+    "        rows.append(list(map(lambda x: (int(x), False),row.strip().replace('  ',' ').split(' '))))\n",
+    "    grids.append(rows)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "2891f090",
+   "metadata": {},
+   "source": [
+    "# commons"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 26,
+   "id": "a460886c",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def mark(ingrids, number):\n",
+    "    grids = []\n",
+    "    for grid in ingrids:\n",
+    "        rows = []\n",
+    "        for row in grid:\n",
+    "            rows.append(list(map(lambda x: (x[0], x[1] or x[0]==number), row)))\n",
+    "        grids.append(rows)\n",
+    "    return grids\n",
+    "\n",
+    "def atleast1_row_completed(grid):\n",
+    "    for row in grid:\n",
+    "        if all(map(lambda x: x[1], row)):\n",
+    "            return True\n",
+    "    return False\n",
+    "\n",
+    "def wining_grid(grid):\n",
+    "    return atleast1_row_completed(grid) or atleast1_row_completed(list(map(list,zip(*grid))))\n",
+    "\n",
+    "from itertools import chain\n",
+    "\n",
+    "def sum_unmarked(grid):\n",
+    "    return sum(map(lambda x: x[0], filter(lambda x: not x[1], list(chain(*grid)))))"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "504cbf6d",
+   "metadata": {},
+   "source": [
+    "# part 1"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 27,
+   "id": "e18c276b",
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "74320"
+      ]
+     },
+     "execution_count": 27,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "def run_1(grids, numbers):\n",
+    "    for number in numbers:\n",
+    "        grids = mark(grids, number)\n",
+    "        for grid in grids:\n",
+    "            if wining_grid(grid):\n",
+    "                return number *sum_unmarked(grid)               \n",
+    "\n",
+    "run_1(grids, numbers)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "48f45375",
+   "metadata": {},
+   "source": [
+    "# part 2"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 28,
+   "id": "61f6c035",
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "17884"
+      ]
+     },
+     "execution_count": 28,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "def run_2(grids, numbers):\n",
+    "    for (i, number) in enumerate(numbers):\n",
+    "        grids = mark(grids, number)\n",
+    "        # stop if all grid are winning except one\n",
+    "        loosing_grids = list(filter(lambda g: not wining_grid(g), grids))\n",
+    "        if len(loosing_grids) == 1:\n",
+    "            lg = loosing_grids[0]\n",
+    "            return run_1([lg], numbers[i+1:])\n",
+    "\n",
+    "run_2(grids, numbers)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "128cac38",
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "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": "3.9.2"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}
diff --git a/d04/input b/d04/input
new file mode 100644
index 0000000..563c8e1
--- /dev/null
+++ b/d04/input
@@ -0,0 +1,601 @@
+46,12,57,37,14,78,31,71,87,52,64,97,10,35,54,36,27,84,80,94,99,22,0,11,30,44,86,59,66,7,90,21,51,53,92,8,76,41,39,77,42,88,29,24,60,17,68,13,79,67,50,82,25,61,20,16,6,3,81,19,85,9,28,56,75,96,2,26,1,62,33,63,32,73,18,48,43,65,98,5,91,69,47,4,38,23,49,34,55,83,93,45,72,95,40,15,58,74,70,89
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