Update solutions to use lib functions, and finish day 3

2024/02/helpful_edge_cases.txt

@@ -0,0 +1,22 @@
+48 46 47 49 51 54 56
+1 1 2 3 4 5
+1 2 3 4 5 5
+5 1 2 3 4 5
+1 4 3 2 1
+1 6 7 8 9
+1 2 3 4 3
+9 8 7 6 7
+7 10 8 10 11
+29 28 27 25 26 25 22 20
+90 89 86 84 83 79
+97 96 93 91 85
+29 26 24 25 21
+36 37 40 43 47
+43 44 47 48 49 54
+35 33 31 29 27 25 22 18
+77 76 73 70 64
+68 65 69 72 74 77 80 83
+37 40 42 43 44 47 51
+70 73 76 79 86
+7 10 8 10 11
+29 28 27 25 26 25 22 20