AoC 2025, day 2, part 1 (dc)

# Command: tr -c '0-9' ' ' <input | dc -fdc-p1.dc

[ q ] sQ
[ dlc+ sc ] sC

?                           # end start ...
[
    se ss
    1                       # i=1 ...
    [
        dddZ Ar^ *+         # i,i i ...

        d le <Q             # quit if (end < i,i)
        d ls !>C            # count if (i,i >= start)

        s. 1+ lLx           # junk i,i; i++ loop
    ] dsLx +s.

    z0<M
] dsMx

[Part 1: ]nlcp