noCanvas()

  let start = 356261

  let end = 846303

  let count = 0

  for (let password = start; password <= end; password++) {

    if (isValidPassword2(password.toString())) {

      count++

    }

  }

  print(count)

}

​

function isValidPassword(string) {

  let hasDouble = false

  for (let i = 0; i < string.length - 1; i++) {

    let a = string[i]

    let b = string[i + 1]

    if (b < a) {

      return false

    }

    if (a == b) {

      hasDouble = true

    }

  }

  if (hasDouble) {

    return true

  } else {

    return false

  }

}

​

function isValidPassword2(string) {

  let onDouble = false

  let hasDouble = false

  for (let i = 0; i < string.length - 1; i++) {

    let a = string[i]

    let b = string[i + 1]

    if (b < a) {

      return false

    }

    if (a == b) {

      if (onDouble) {

        hasDouble = false

      } else {

        hasDouble = true

      }

      onDouble = true

    } 

  }

  if (hasDouble) {

    return true

  }

  return false

}

​