advent_1

gistfile1.txt

Some stuff

index.php

<?php

$entries = [ 1254,
1313,
1456,
1782,
1742,
1391,
1273,
1286,
1373,
1891,
1188,
1994,
1887,
1816,
1984,
961,
1428,
1105,
1123,
1699,
1154,
1953,
1977,
1450,
1696,
1068,
1241,
1926,
1228,
1591,
1789,
1966,
1508,
1193,
1190,
1654,
444,
1282,
1169,
1165,
1778,
1669,
1570,
1671,
1845,
1208,
1728,
1798,
847,
1300,
1817,
1200,
1297,
1658,
1296,
1571,
1991,
1305,
1314,
1903,
1472,
1359,
1506,
1999,
1877,
1168,
1137,
1288,
1083,
1656,
413,
1430,
1408,
1397,
1846,
1218,
684,
1234,
2007,
900,
1604,
1460,
1848,
1693,
1324,
1401,
1968,
1918,
1975,
1665,
1413,
1874,
1852,
1521,
1753,
1229,
1940,
1650,
1976,
1235,
1130,
1927,
1365,
1908,
1441,
1302,
1986,
1449,
1692,
1944,
1277,
1312,
1826,
1231,
1289,
1814,
1170,
1606,
1608,
1773,
1883,
1936,
1626,
1497,
1860,
1673,
1295,
2005,
1481,
1995,
1734,
1646,
1557,
1298,
1174,
1894,
1309,
1240,
1982,
1414,
1799,
1620,
1863,
1220,
1642,
508,
1146,
1187,
1253,
1284,
1952,
1527,
1610,
1333,
1221,
1362,
1457,
1721,
1493,
1330,
156,
1647,
1841,
1724,
2000,
1398,
1745,
1985,
1269,
1722,
2001,
1923,
1395,
1094,
1140,
1958,
1239,
1336,
1588,
1338,
1750,
1757,
1444,
1822,
1335,
1941,
1865,
1767,
1881,
1499,
1157,
1990,
1210,
1779,
1201,
1784,
1961,
1476,
1861,
1468,
];

// =============== PART ONE =================

for ($i = 0; $i < count($entries); $i++) {
    for ($j = 0; $j < count($entries); $j++) { 
        if($entries[$i] + $entries[$j] == 2020){
            $mult = $entries[$i] * $entries[$j];
            echo $mult . '  ==> First solution. ';
            break 2;
        }
    }
}


// =============== PART TWO =================

for ($i = 0; $i < count($entries); $i++) {
    for ($j = 0; $j < count($entries); $j++) { 
        for ($k=0; $k < count($entries); $k++) { 
            if($entries[$i] + $entries[$j] + $entries[$k] == 2020){
                $mult2 = $entries[$i] * $entries[$j] * $entries[$k];
                echo $mult2 . ' ==> Second solution ';
                break 3;
            }
        }
    }
}