happyticket

import strutils, math

proc cut[T](num: T; x: int): int =
  num div pow(10.0, x.float).int

proc nth[T](num: T; th: int): int =
  cut(num, th) - 10*cut(num, th+1)

var counter = 0
for i in 1_001..999_999:
  let
    sum_left = nth(i, 5) + nth(i, 4) + nth(i, 3)
    sum_right = nth(i, 2) + nth(i, 1) + nth(i, 0)
  if sum_left == sum_right:
    inc counter

echo "Found $# happy tickets." % [$counter]