3 $triangle_source = <<TRIANGLE
11 99 65 04 28 06 16 70 92
12 41 41 26 56 83 40 80 70 33
13 41 48 72 33 47 32 37 16 94 29
14 53 71 44 65 25 43 91 52 97 51 14
15 70 11 33 28 77 73 17 78 39 68 17 57
16 91 71 52 38 17 14 91 43 58 50 27 29 48
17 63 66 04 68 89 53 67 30 73 16 69 87 40 31
18 04 62 98 27 23 09 70 98 73 93 38 53 60 04 23
21 $triangle = $triangle_source.split("\n").map
{|line
| line
.split
.map
{|s
| s
.to_i
}}
23 def find_best(triangle
)
24 log
= Logger
.new(STDERR)
25 log
.level
= Logger
::WARN
26 last_line_totals
= [0]
28 triangle
.each
do |line
|
29 log
.info
{"Checking line #{line}"}
31 line
.each_index
do |i
|
32 this_line_totals
<< [i
== 0 ? 0 : last_line_totals
[i-1
] + line
[i
],
33 i
== last_line_totals
.length
? 0 : last_line_totals
[i
] + line
[i
]].max
35 log
.info
{"Best totals for line #{line} are #{this_line_totals}"}
36 last_line_totals
= this_line_totals
43 puts find_best
$triangle