2020 AoC, Days 1-4

2020/Day 1/Solution.py

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+target = 2020
+input_file = "/tmp/aocinput"
+
+def find_sum_of_two():
+    large_n = []
+    small_n = []
+
+    with open(input_file) as file:
+        line = file.readline()
+        while line and line != "\n":
+            halftarget_count = 0
+
+            number = int(line)
+            if number > target/2:
+                large_n.append(number)
+            elif number == target/2:
+                halftarget_count += 1
+            else:
+                small_n.append(number)
+
+            if halftarget_count == 2:
+                print(f"Found a sum : {target/2}*2 = {target}\nAnswer is {(target/2)**2}")
+                break
+
+            line = file.readline()
+
+    for big_one in large_n:
+        complement = target-big_one
+        if complement in small_n:
+            print(f"Found a sum : {big_one}+{complement} = {target}\nAnswer is {big_one*complement}")
+            return
+
+    print("No sum found that can reach {target}")
+
+def sum_search(target_sum, inputs):
+    lower = []
+    upper = []
+
+    for num in inputs:
+        if num < target_sum/2:
+            lower.append(num)
+        else:
+            upper.append(num)
+
+    search_list = lower if len(lower) < len(upper) else upper
+    iter_list = upper if len(lower) < len(upper) else lower
+
+    for num in iter_list:
+        if target_sum - num in search_list:
+            return num, target_sum-num
+
+    return False
+
+
+def find_sum_of_three():
+    data = []
+    subtracted_to_target = []
+    with open(input_file) as file:
+        line = file.readline()
+        while line and line != "\n":
+            data.append(int(line))
+            subtracted_to_target.append((target-data[-1],data[-1]))
+
+            line = file.readline()
+
+    data.sort()
+
+    for sub_target in subtracted_to_target:
+        result = sum_search(sub_target[0],data)
+        if result:
+            print(f"Sum found : {result[0]}+{result[1]}+{sub_target[1]} = {target}\nResult is {result[0]*result[1]*sub_target[1]}")
+            return
+
+    print("No sum found")
+
+

2020/Day 1/input.txt

@@ -0,0 +1,200 @@
+1322
+1211
+1427
+1428
+1953
+1220
+1629
+1186
+1354
+1776
+1906
+1849
+1327
+1423
+401
+1806
+1239
+1934
+1256
+1223
+1504
+1365
+1653
+1706
+1465
+1810
+1089
+1447
+1983
+1505
+1763
+1590
+1843
+1534
+1886
+1842
+1878
+1785
+1121
+1857
+1496
+1696
+1863
+1944
+1692
+1255
+1572
+1767
+1509
+1845
+1479
+1935
+1507
+1852
+1193
+1797
+1573
+1317
+1266
+1707
+1819
+925
+1976
+1908
+1571
+1646
+1625
+1719
+1980
+1970
+1566
+1679
+1484
+1818
+1985
+1794
+1699
+1530
+1645
+370
+1658
+1345
+1730
+1340
+1281
+1722
+1623
+1148
+1545
+1728
+1325
+1164
+1462
+1893
+1736
+160
+1543
+1371
+1930
+1162
+2010
+1302
+1967
+1889
+1547
+1335
+1416
+1359
+1622
+1682
+1701
+1939
+1697
+1436
+1367
+1119
+1741
+1466
+1997
+1856
+1824
+1323
+1478
+1963
+1832
+1748
+1260
+1244
+1834
+1990
+1567
+1147
+1588
+1694
+1487
+1151
+1347
+1315
+1502
+546
+730
+1742
+1869
+1277
+1224
+1169
+1708
+1661
+174
+1207
+1801
+1880
+1390
+1747
+1215
+1684
+1498
+1965
+1933
+1693
+1129
+1578
+1189
+1251
+1727
+1440
+1178
+746
+1564
+944
+1822
+1225
+1523
+1575
+1185
+37
+1866
+1766
+1737
+1800
+1633
+1796
+1161
+1932
+1583
+1395
+1288
+1991
+229
+1875
+1540
+1876
+1191
+1858
+1713
+1725
+1955
+1250
+1987
+1724