AoC 2017, Day 11, Nim

day11.nim

import sequtils

let
  child_steps = toSeq(readLine(stdin).items)

var
  cx, cy, furthest = 0

proc dist(): int = max(abs(cx), abs(cy))

for ch in child_steps:
  if ch == 'n': cy += 1
  if ch == 's': cy -= 1
  if ch == 'e': cx += 1
  if ch == 'w': cx -= 1
  if ch == ',': furthest = max(furthest, dist())

# handle last step
furthest = max(furthest, dist())

echo "child is ", dist(), " steps away. Furthest was ", furthest, " steps."