bits from phosphorus as well

01/1_nice.py

@@ -0,0 +1,4 @@
+nums = (2004,1671,1678,1304,1242,1882,1605,1034,1883,1589,1881,1546,1713,1218,1982,1395,1277,1417,1497,1499,1847,1989,1172,1684,1243,1843,1661,1662,1421,1790,1344,1458,1074,1809,1990,1369,1386,1736,1972,1634,1229,1123,1870,1595,1934,1399,1732,1545,1208,368,1907,1143,443,1929,1965,1872,1738,1967,997,1473,1041,1991,1868,1180,1409,1379,1568,1163,1869,1391,1956,1249,1505,351,2001,462,1219,1731,1802,1798,1626,1438,1099,1477,1980,1708,1666,1066,1121,1359,1426,1734,1768,1836,1453,923,1660,1878,1522,1024,1429,232,1952,1730,1763,1981,1388,1337,1317,1922,1044,1999,1341,1178,1524,1185,1257,1256,1061,1262,1022,1778,1917,1205,1272,1842,1533,1194,1746,1691,1617,1667,1940,1171,1792,1773,1411,1902,1859,1978,1764,1482,1276,735,1716,1915,1675,1126,1830,1227,1299,1535,1700,1658,1771,1823,1055,1602,1590,1983,1885,1735,103,1766,14,1486,1939,1525,1916,1279,544,1406,1674,1948,1971,1651,1715,1943,1784,2008,1800,1720,1557,1467,1371,1637,1345,1924,1565,1976,1827,1890,1848,1465,1573,1231,1310,1754,1569,1532)
+for num in nums:
+    if (2020 - num) in nums:
+        print(num * (2020-num))

02/1.py

@@ -0,0 +1,6 @@
+lines = open("input", "r").read().split("\n")
+import re
+matches = [re.match(r"^([0-9]+)-([0-9]+) ([a-z]): ([a-z]+)$", line) for line in lines]
+matches = [m for m in matches if m is not None]
+valids = [True for m in matches if int(m.group(1)) <= len([c for c in m.group(4) if c == m.group(3)]) <= int(m.group(2))]
+print(len(valids))

02/2.py

@@ -0,0 +1,6 @@
+lines = open("input", "r").read().split("\n")
+import re
+matches = [re.match(r"^([0-9]+)-([0-9]+) ([a-z]): ([a-z]+)$", line) for line in lines]
+matches = [m for m in matches if m is not None]
+valids = [True for m in matches if (m.group(4)[int(m.group(1)) - 1] == m.group(3)) ^ (m.group(4)[int(m.group(2)) - 1] == m.group(3))]
+print(len(valids))

02/test

@@ -0,0 +1,3 @@
+1-3 a: abcde
+1-3 b: cdefg
+2-9 c: ccccccccc