day4.ts

const input = [240298, 784956] as const



function findCodes(min: number, max: number) {
  const results: number[] = []

  next:
  for (let i = min; i <= max; i++) {
    const code = String(i)

    let double = false
    let adjCount = 1
    let last: number | undefined = undefined

    for (const char of code) {
      const num = Number(char)

      if (num === last) {
        adjCount++
      } else {
        if (adjCount === 2) {
          double = true
        }
        adjCount = 1
      }

      if (last != null && num < last) {
        continue next
      }

      last = num
    }

     if (adjCount === 2) {
          double = true
        }

    if (double) {
      results.push(i)
    }
  }

  return results
}


const codes = findCodes(...input)

console.log(codes.length)