Advent of Code 2025
arthomnix.dev
d07/part1: simplify counting code to only handle up to 4 digits as that's all we need
+4
-8
d07/part1.sed
+4
-8
d07/part1.sed
···
13
13
: a; s/aaaaaaaaaa/b/g; t b; b loop
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: b; s/bbbbbbbbbb/c/g; t c; b loop
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: c; s/cccccccccc/d/g; t d; b loop
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: d; s/dddddddddd/e/g; t e; b loop
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: e; s/eeeeeeeeee/f/g; t f; b loop
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: f; s/ffffffffff/g/g; t g; b loop
19
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: g; s/gggggggggg/h/g; t h; b loop
20
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: h; s/hhhhhhhhhh//g
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+
: d; s/dddddddddd//g
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: loop
22
-
/a/! s/[b-h]*/&0/
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+
/a/! s/[b-d]*/&0/
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19
s/aaaaaaaaa/9/
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20
s/aaaaaaaa/8/
25
21
s/aaaaaaa/7/
···
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27
s/a/1/
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: next
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y/bcdefgh/abcdefg/
34
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/[a-h]/ b loop
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+
/[a-d]/ b loop
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31
# on the last line, print out the answer
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32
$p
37
33
···
52
48
s/D/|/g # replace the intermediate "D" marker we used in the loop with '|'
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s/.*\n// # get rid of the first line in the current pair
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H # put the line in hold space
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b outer # and loop
51
+
b outer # and loop