aoc2025-day02-part1.py

import math

l=list(map(lambda x:list(map(int,x.split("-"))), input().split(",")))

x=0
for a in l:
  d1=math.ceil(math.log10(a[0]))
  d2=math.ceil(math.log10(a[1]))
  for d in range(d1, d2+1):
    if d%2==1: continue
    k=int(10**(d/2))
    if d==d1:
      s=math.floor(a[0]/k)
      if s<a[0]%k:
        s+=1
    else:
      s=int(10**(d/2-1))
    if d==d2:
      e=math.floor(a[1]/k)
      if e>a[1]%k:
        e-=1
    else:
      e=k-1
    s=int(s+s*k)
    e=int(e+e*k)
    r=range(s,e+1,k+1)
    x+=sum(r)

print(x)