Day 17 done

[advent-of-code-17.git] / src / advent17 / advent17.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "{-# LANGUAGE NegativeLiterals #-}\n",
    "{-# LANGUAGE FlexibleContexts #-}\n",
    "{-# LANGUAGE OverloadedStrings #-}\n",
    "{-# LANGUAGE TypeFamilies #-}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "import Prelude hiding ((++))\n",
    "import Data.Vector.Unboxed ((!), (++), (//))\n",
    "import qualified Data.Vector.Unboxed as V\n",
    "import qualified Data.List as L"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [],
   "source": [
    "type RingBuffer = V.Vector Int"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [],
   "source": [
    "initialStepSize = 366\n",
    "\n",
    "initialRingBuffer :: RingBuffer\n",
    "initialRingBuffer = V.singleton 0"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [],
   "source": [
    "updateRingBufferInc nextValue stepSize buffer = (buffer', stepSize + 1)\n",
    "    where nextPos = (stepSize + 1) `rem` V.length buffer\n",
    "          (start, end) = V.splitAt nextPos buffer\n",
    "          buffer' = V.cons nextValue $ end ++ start"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [],
   "source": [
    "updateRingBuffer nextValue stepSize buffer = (buffer', stepSize)\n",
    "    where nextPos = (stepSize + 1) `rem` V.length buffer\n",
    "          (start, end) = V.splitAt nextPos buffer\n",
    "          buffer' = V.cons nextValue $ end ++ start"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "([1,0],0)"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "updateRingBuffer 1 0 initialRingBuffer"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<style>/* Styles used for the Hoogle display in the pager */\n",
       ".hoogle-doc {\n",
       "display: block;\n",
       "padding-bottom: 1.3em;\n",
       "padding-left: 0.4em;\n",
       "}\n",
       ".hoogle-code {\n",
       "display: block;\n",
       "font-family: monospace;\n",
       "white-space: pre;\n",
       "}\n",
       ".hoogle-text {\n",
       "display: block;\n",
       "}\n",
       ".hoogle-name {\n",
       "color: green;\n",
       "font-weight: bold;\n",
       "}\n",
       ".hoogle-head {\n",
       "font-weight: bold;\n",
       "}\n",
       ".hoogle-sub {\n",
       "display: block;\n",
       "margin-left: 0.4em;\n",
       "}\n",
       ".hoogle-package {\n",
       "font-weight: bold;\n",
       "font-style: italic;\n",
       "}\n",
       ".hoogle-module {\n",
       "font-weight: bold;\n",
       "}\n",
       ".hoogle-class {\n",
       "font-weight: bold;\n",
       "}\n",
       ".get-type {\n",
       "color: green;\n",
       "font-weight: bold;\n",
       "font-family: monospace;\n",
       "display: block;\n",
       "white-space: pre-wrap;\n",
       "}\n",
       ".show-type {\n",
       "color: green;\n",
       "font-weight: bold;\n",
       "font-family: monospace;\n",
       "margin-left: 1em;\n",
       "}\n",
       ".mono {\n",
       "font-family: monospace;\n",
       "display: block;\n",
       "}\n",
       ".err-msg {\n",
       "color: red;\n",
       "font-style: italic;\n",
       "font-family: monospace;\n",
       "white-space: pre;\n",
       "display: block;\n",
       "}\n",
       "#unshowable {\n",
       "color: red;\n",
       "font-weight: bold;\n",
       "}\n",
       ".err-msg.in.collapse {\n",
       "padding-top: 0.7em;\n",
       "}\n",
       ".highlight-code {\n",
       "white-space: pre;\n",
       "font-family: monospace;\n",
       "}\n",
       ".suggestion-warning { \n",
       "font-weight: bold;\n",
       "color: rgb(200, 130, 0);\n",
       "}\n",
       ".suggestion-error { \n",
       "font-weight: bold;\n",
       "color: red;\n",
       "}\n",
       ".suggestion-name {\n",
       "font-weight: bold;\n",
       "}\n",
       "</style><span class='err-msg'>&lt;interactive&gt;:1:1: error:<br/>    • Variable not in scope: updateRingBufferE :: Integer -&gt; Integer -&gt; RingBuffer -&gt; t<br/>    • Perhaps you meant one of these: ‘updateRingBuffer’ (line 1), ‘updateRingBufferInc’ (line 1)</span>"
      ],
      "text/plain": [
       "<interactive>:1:1: error:\n",
       "    • Variable not in scope: updateRingBufferE :: Integer -> Integer -> RingBuffer -> t\n",
       "    • Perhaps you meant one of these: ‘updateRingBuffer’ (line 1), ‘updateRingBufferInc’ (line 1)"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "updateRingBufferE 1 0 initialRingBuffer"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[0]"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "initialRingBuffer"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [],
   "source": [
    "ringBufferUnfolder :: (Int, Int, RingBuffer) -> Maybe (RingBuffer, (Int, Int, RingBuffer))\n",
    "ringBufferUnfolder (nextValue, stepSize, buffer) = Just (buffer', (nextValue + 1, stepSize', buffer'))\n",
    "    where (buffer', stepSize') = updateRingBuffer nextValue stepSize buffer"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "1025"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "(!1) $ last $ take 2017 $ L.unfoldr ringBufferUnfolder (1, 366, initialRingBuffer)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[0,1,2,3,4,5,6,7,8]"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "t = V.fromList [0,1,2,3,4,5,6,7,8] :: RingBuffer\n",
    "t"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "([9,4,5,6,7,8,0,1,2,3],3)"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "updateRingBuffer 9 3 t"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "metadata": {},
   "outputs": [],
   "source": [
    "updateRingBufferE nextValue _stepSize buffer = (buffer', 3)\n",
    "    where nextPos = (3 + 1) `rem` V.length buffer\n",
    "          (start, end) = V.splitAt nextPos buffer\n",
    "          buffer' = V.cons nextValue $ end ++ start"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 15,
   "metadata": {},
   "outputs": [],
   "source": [
    "ringBufferUnfolderE :: (Int, Int, RingBuffer) -> Maybe (RingBuffer, (Int, Int, RingBuffer))\n",
    "ringBufferUnfolderE (nextValue, stepSize, buffer) = Just (buffer', (nextValue + 1, stepSize', buffer'))\n",
    "    where (buffer', stepSize') = updateRingBufferE nextValue stepSize buffer"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "metadata": {
    "scrolled": true
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[2017,638,1513,851,1135,269,1514,359,479,1136,1515,852,639,11,1516,1137,202,853,1517,85,1138,640,1518,480,854,1139,1519,360,270,641,1520,1140,855,20,1521,481,1141,152,1522,856,642,1142,1523,361,203,857,1524,1143,482,643,1525,271,1144,858,1526,114,362,1145,1527,644,859,483,1528,1146,64,48,1529,860,1147,645,1530,272,484,1148,1531,861,363,646,1532,1149,204,862,1533,153,1150,485,1534,647,863,1151,1535,86,364,273,1536,1152,864,648,1537,486,1153,115,1538,865,205,1154,1539,649,365,866,1540,1155,487,36,1541,650,1156,867,1542,274,154,1157,1543,488,868,651,1544,1158,366,27,1545,869,1159,206,1546,652,489,1160,1547,870,275,367,1548,1161,653,871,1549,65,1162,490,1550,116,872,1163,1551,654,155,368,1552,1164,873,491,1553,655,1165,276,1554,874,207,1166,1555,87,656,875,1556,1167,492,369,1557,15,1168,876,1558,657,277,1169,1559,493,877,49,1560,1170,658,370,1561,878,1171,208,1562,494,659,1172,1563,879,156,278,1564,1173,371,880,1565,660,1174,495,1566,117,881,1175,1567,6,661,209,1568,1176,882,496,1569,372,1177,662,1570,883,279,1178,1571,88,497,884,1572,1179,663,157,1573,373,1180,885,1574,66,664,1181,1575,498,886,280,1576,1182,210,665,1577,887,1183,374,1578,499,118,1184,1579,888,666,37,1580,1185,281,889,1581,500,1186,667,1582,375,890,1187,1583,158,211,668,1584,1188,891,501,1585,1,1189,376,1586,892,669,1190,1587,282,502,893,1588,1191,89,670,1589,119,1192,894,1590,377,503,1193,1591,671,895,212,1592,1194,283,159,1593,896,1195,672,1594,504,378,1196,1595,897,50,673,1596,1197,67,898,1597,505,1198,284,1598,674,899,1199,1599,379,213,506,1600,1200,900,675,1601,28,1201,160,1602,901,380,1202,1603,676,507,902,1604,1203,285,120,1605,677,1204,903,1606,214,508,1205,1607,381,904,678,1608,1206,90,286,1609,905,1207,509,1610,679,21,1208,1611,906,382,161,1612,1209,680,907,1613,510,1210,215,1614,287,908,1211,1615,681,383,511,1616,1212,909,38,1617,682,1213,121,1618,910,68,1214,1619,512,683,911,1620,1215,384,288,1621,216,1216,912,1622,684,513,1217,1623,162,913,385,1624,1218,685,91,1625,914,1219,514,1626,289,686,1220,1627,915,51,386,1628,1221,515,916,1629,687,1222,217,1630,122,917,1223,1631,290,688,516,1632,1224,918,387,1633,163,1225,689,1634,919,0,1226,1635,517,218,920,1636,1227,690,388,1637,291,1228,921,1638,518,691,1229,1639,16,922,92,1640,1230,389,692,1641,923,1231,519,1642,164,292,1232,1643,924,693,219,1644,1233,520,925,1645,390,1234,694,1646,123,926,1235,1647,69,521,695,1648,1236,927,293,1649,391,1237,29,1650,928,696,1238,1651,522,220,929,1652,1239,165,697,1653,392,1240,930,1654,523,294,1241,1655,698,931,52,1656,1242,124,524,1657,932,1243,699,1658,393,221,1244,1659,933,295,700,1660,1245,525,934,1661,93,1246,394,1662,701,935,1247,1663,166,526,39,1664,1248,936,702,1665,296,1249,395,1666,937,527,1250,1667,703,222,938,1668,1251,70,125,1669,704,1252,939,1670,528,396,1253,1671,297,940,705,1672,1254,167,529,1673,941,1255,223,1674,706,397,1256,1675,942,12,530,1676,1257,707,943,1677,298,1258,94,1678,398,944,1259,1679,708,531,22,1680,1260,945,224,1681,709,1261,299,1682,946,532,1262,1683,399,710,947,1684,1263,168,126,1685,533,1264,948,1686,711,53,1265,1687,400,949,300,1688,1266,712,534,1689,950,1267,225,1690,71,713,1268,1691,951,401,535,1692,1269,169,952,1693,714,1270,301,1694,95,953,1271,1695,536,715,402,1696,1272,954,226,1697,127,1273,716,1698,955,537,1274,1699,302,403,956,1700,1275,717,9,1701,538,1276,957,1702,170,718,1277,1703,227,958,404,1704,1278,539,719,1705,959,1279,303,1706,40,30,1280,1707,960,720,540,1708,1281,405,961,1709,128,1282,721,1710,304,962,1283,1711,541,228,722,1712,1284,963,406,1713,171,1285,542,1714,964,723,1286,1715,96,305,965,1716,1287,407,724,1717,543,1288,966,1718,72,229,1289,1719,725,967,54,1720,1290,544,408,1721,968,1291,726,1722,306,172,1292,1723,969,545,727,1724,1293,129,970,1725,409,1294,230,1726,728,971,1295,1727,546,307,5,1728,1296,972,729,1729,410,1297,547,1730,973,97,1298,1731,730,173,974,1732,1299,308,548,1733,731,1300,975,1734,411,231,1301,1735,17,976,732,1736,1302,549,130,1737,977,1303,412,1738,733,309,1304,1739,978,550,73,1740,1305,734,979,1741,232,1306,413,1742,551,980,1307,1743,735,174,310,1744,1308,981,41,1745,736,1309,552,1746,982,414,1310,1747,98,737,983,1748,1311,233,553,1749,311,1312,984,1750,738,415,1313,1751,131,985,554,1752,1314,739,175,1753,986,1315,55,1754,416,740,1316,1755,987,555,312,1756,1317,234,988,1757,741,1318,23,1758,556,989,1319,1759,417,742,74,1760,1320,990,313,1761,557,1321,743,1762,991,176,1322,1763,418,235,992,1764,1323,744,558,1765,132,1324,993,1766,314,745,1325,1767,419,994,559,1768,1326,99,746,1769,995,1327,31,1770,236,560,1328,1771,996,747,420,1772,1329,315,997,1773,177,1330,748,1774,561,998,1331,1775,7,421,749,1776,1332,999,133,1777,562,1333,316,1778,1000,750,1334,1779,237,422,1001,1780,1335,563,751,1781,56,1336,1002,1782,178,317,1337,1783,752,1003,564,1784,1338,423,100,1785,1004,1339,753,1786,238,565,1340,1787,1005,75,754,1788,1341,424,1006,1789,318,1342,566,1790,755,1007,1343,1791,134,179,425,1792,1344,1008,756,1793,567,1345,239,1794,1009,319,1346,1795,757,42,1010,1796,1347,568,426,1797,7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      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "last $ take 2017 $ L.unfoldr ringBufferUnfolderE (1, 3, initialRingBuffer)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "metadata": {},
   "outputs": [],
   "source": [
    "part1 n k = (!1) $ last $ take k $ L.unfoldr ringBufferUnfolder (1, n, initialRingBuffer)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 18,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "1025"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "part1 366 2017"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<style>/* Styles used for the Hoogle display in the pager */\n",
       ".hoogle-doc {\n",
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       ".hoogle-code {\n",
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       "font-family: monospace;\n",
       "white-space: pre;\n",
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       ".hoogle-text {\n",
       "display: block;\n",
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       ".hoogle-name {\n",
       "color: green;\n",
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       ".hoogle-head {\n",
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       "font-family: monospace;\n",
       "display: block;\n",
       "}\n",
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       "}\n",
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       "}\n",
       ".suggestion-name {\n",
       "font-weight: bold;\n",
       "}\n",
       "</style><div class=\"suggestion-name\" style=\"clear:both;\">Redundant bracket</div><div class=\"suggestion-row\" style=\"float: left;\"><div class=\"suggestion-warning\">Found:</div><div class=\"highlight-code\" id=\"haskell\">(zeroLoc + 1) `rem` (V.length finalBuffer)</div></div><div class=\"suggestion-row\" style=\"float: left;\"><div class=\"suggestion-warning\">Why Not:</div><div class=\"highlight-code\" id=\"haskell\">(zeroLoc + 1) `rem` V.length finalBuffer</div></div>"
      ],
      "text/plain": [
       "Line 4: Redundant bracket\n",
       "Found:\n",
       "(zeroLoc + 1) `rem` (V.length finalBuffer)\n",
       "Why not:\n",
       "(zeroLoc + 1) `rem` V.length finalBuffer"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "part2 n k = finalBuffer!targetLoc\n",
    "    where finalBuffer = last $ take k $ L.unfoldr ringBufferUnfolder (1, n, initialRingBuffer)\n",
    "          zeroLoc = V.head $ V.elemIndices 0 finalBuffer\n",
    "          targetLoc = (zeroLoc + 1) `rem` (V.length finalBuffer)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 20,
   "metadata": {},
   "outputs": [],
   "source": [
    "-- part2 366 50000000"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 21,
   "metadata": {},
   "outputs": [],
   "source": [
    "urb buffer = buffer'\n",
    "    where nextPos = (initialStepSize + 1) `rem` V.length buffer\n",
    "          (start, end) = V.splitAt nextPos buffer\n",
    "          nextValue = V.length buffer\n",
    "          buffer' = V.cons nextValue $ end ++ start"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 27,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<style>/* Styles used for the Hoogle display in the pager */\n",
       ".hoogle-doc {\n",
       "display: block;\n",
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       "}\n",
       ".hoogle-code {\n",
       "display: block;\n",
       "font-family: monospace;\n",
       "white-space: pre;\n",
       "}\n",
       ".hoogle-text {\n",
       "display: block;\n",
       "}\n",
       ".hoogle-name {\n",
       "color: green;\n",
       "font-weight: bold;\n",
       "}\n",
       ".hoogle-head {\n",
       "font-weight: bold;\n",
       "}\n",
       ".hoogle-sub {\n",
       "display: block;\n",
       "margin-left: 0.4em;\n",
       "}\n",
       ".hoogle-package {\n",
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       ".hoogle-class {\n",
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       "}\n",
       ".get-type {\n",
       "color: green;\n",
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       ".show-type {\n",
       "color: green;\n",
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       "font-family: monospace;\n",
       "margin-left: 1em;\n",
       "}\n",
       ".mono {\n",
       "font-family: monospace;\n",
       "display: block;\n",
       "}\n",
       ".err-msg {\n",
       "color: red;\n",
       "font-style: italic;\n",
       "font-family: monospace;\n",
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       "color: red;\n",
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       ".err-msg.in.collapse {\n",
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       "}\n",
       ".highlight-code {\n",
       "white-space: pre;\n",
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       "}\n",
       ".suggestion-warning { \n",
       "font-weight: bold;\n",
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       "}\n",
       ".suggestion-error { \n",
       "font-weight: bold;\n",
       "color: red;\n",
       "}\n",
       ".suggestion-name {\n",
       "font-weight: bold;\n",
       "}\n",
       "</style><div class=\"suggestion-name\" style=\"clear:both;\">Redundant bracket</div><div class=\"suggestion-row\" style=\"float: left;\"><div class=\"suggestion-warning\">Found:</div><div class=\"highlight-code\" id=\"haskell\">(iterate urb initialRingBuffer) !! 5</div></div><div class=\"suggestion-row\" style=\"float: left;\"><div class=\"suggestion-warning\">Why Not:</div><div class=\"highlight-code\" id=\"haskell\">iterate urb initialRingBuffer !! 5</div></div>"
      ],
      "text/plain": [
       "Line 1: Redundant bracket\n",
       "Found:\n",
       "(iterate urb initialRingBuffer) !! 5\n",
       "Why not:\n",
       "iterate urb initialRingBuffer !! 5"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "text/plain": [
       "[5,3,0,1,4,2]"
      ]
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     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "(iterate urb initialRingBuffer)!!5"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 28,
   "metadata": {},
   "outputs": [
    {
     "data": {
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       "<style>/* Styles used for the Hoogle display in the pager */\n",
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       "font-weight: bold;\n",
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       ".suggestion-name {\n",
       "font-weight: bold;\n",
       "}\n",
       "</style><div class=\"suggestion-name\" style=\"clear:both;\">Redundant bracket</div><div class=\"suggestion-row\" style=\"float: left;\"><div class=\"suggestion-warning\">Found:</div><div class=\"highlight-code\" id=\"haskell\">(iterate urb initialRingBuffer) !! k</div></div><div class=\"suggestion-row\" style=\"float: left;\"><div class=\"suggestion-warning\">Why Not:</div><div class=\"highlight-code\" id=\"haskell\">iterate urb initialRingBuffer !! k</div></div>"
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       "Line 1: Redundant bracket\n",
       "Found:\n",
       "(iterate urb initialRingBuffer) !! k\n",
       "Why not:\n",
       "iterate urb initialRingBuffer !! k"
      ]
     },
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   "source": [
    "part1 k = (!1) $ (iterate urb initialRingBuffer)!!k"
   ]
  },
  {
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   "execution_count": 29,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "1025"
      ]
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     "output_type": "display_data"
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   "source": [
    "part1 2017"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "part1 k = (!1) $ (iterate urb initialRingBuffer)!!k"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 30,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<style>/* Styles used for the Hoogle display in the pager */\n",
       ".hoogle-doc {\n",
       "display: block;\n",
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       "padding-left: 0.4em;\n",
       "}\n",
       ".hoogle-code {\n",
       "display: block;\n",
       "font-family: monospace;\n",
       "white-space: pre;\n",
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       ".hoogle-text {\n",
       "display: block;\n",
       "}\n",
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       "color: green;\n",
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       ".hoogle-sub {\n",
       "display: block;\n",
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       ".get-type {\n",
       "color: green;\n",
       "font-weight: bold;\n",
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       "display: block;\n",
       "white-space: pre-wrap;\n",
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       ".show-type {\n",
       "color: green;\n",
       "font-weight: bold;\n",
       "font-family: monospace;\n",
       "margin-left: 1em;\n",
       "}\n",
       ".mono {\n",
       "font-family: monospace;\n",
       "display: block;\n",
       "}\n",
       ".err-msg {\n",
       "color: red;\n",
       "font-style: italic;\n",
       "font-family: monospace;\n",
       "white-space: pre;\n",
       "display: block;\n",
       "}\n",
       "#unshowable {\n",
       "color: red;\n",
       "font-weight: bold;\n",
       "}\n",
       ".err-msg.in.collapse {\n",
       "padding-top: 0.7em;\n",
       "}\n",
       ".highlight-code {\n",
       "white-space: pre;\n",
       "font-family: monospace;\n",
       "}\n",
       ".suggestion-warning { \n",
       "font-weight: bold;\n",
       "color: rgb(200, 130, 0);\n",
       "}\n",
       ".suggestion-error { \n",
       "font-weight: bold;\n",
       "color: red;\n",
       "}\n",
       ".suggestion-name {\n",
       "font-weight: bold;\n",
       "}\n",
       "</style><div class=\"suggestion-name\" style=\"clear:both;\">Redundant bracket</div><div class=\"suggestion-row\" style=\"float: left;\"><div class=\"suggestion-warning\">Found:</div><div class=\"highlight-code\" id=\"haskell\">(iterate urb initialRingBuffer) !! k</div></div><div class=\"suggestion-row\" style=\"float: left;\"><div class=\"suggestion-warning\">Why Not:</div><div class=\"highlight-code\" id=\"haskell\">iterate urb initialRingBuffer !! k</div></div><div class=\"suggestion-name\" style=\"clear:both;\">Redundant bracket</div><div class=\"suggestion-row\" style=\"float: left;\"><div class=\"suggestion-warning\">Found:</div><div class=\"highlight-code\" id=\"haskell\">(zeroLoc + 1) `rem` (V.length finalBuffer)</div></div><div class=\"suggestion-row\" style=\"float: left;\"><div class=\"suggestion-warning\">Why Not:</div><div class=\"highlight-code\" id=\"haskell\">(zeroLoc + 1) `rem` V.length finalBuffer</div></div>"
      ],
      "text/plain": [
       "Line 2: Redundant bracket\n",
       "Found:\n",
       "(iterate urb initialRingBuffer) !! k\n",
       "Why not:\n",
       "iterate urb initialRingBuffer !! kLine 4: Redundant bracket\n",
       "Found:\n",
       "(zeroLoc + 1) `rem` (V.length finalBuffer)\n",
       "Why not:\n",
       "(zeroLoc + 1) `rem` V.length finalBuffer"
      ]
     },
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    }
   ],
   "source": [
    "part2 k = finalBuffer!targetLoc\n",
    "    where finalBuffer = (iterate urb initialRingBuffer)!!k\n",
    "          zeroLoc = V.head $ V.elemIndices 0 finalBuffer\n",
    "          targetLoc = (zeroLoc + 1) `rem` (V.length finalBuffer)"
   ]
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   "cell_type": "code",
   "execution_count": 32,
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    {
     "data": {
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       "13990"
      ]
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     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "part2 50000"
   ]
  },
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   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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