Submission #3446461

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Source Code Expand

from strutils import split, parseInt, parseFloat
from sequtils import map

import macros
macro unpack*(input: seq; count: static[int]): untyped =
  result = quote do: ()
  when NimMinor <= 13: # 本当にここが区切りかどうかは知らない
    for i in 0..<count: result[0].add quote do: `input`[`i`]
  else:
    for i in 0..<count: result.add quote do: `input`[`i`]

# count == 0 のとき unpackしない
# count >  0 のとき count個分 unpack した結果の tuple を返す
type UnselectableTypeError = object of Exception
template input*(typ: typedesc; count: static[Natural] = 0): untyped =
  let line = stdin.readLine.split
  when count == 0:
    when typ is int:    line.map(parseInt)
    elif typ is float:  line.map(parseFloat)
    elif typ is string: line
    else: raise newException(UnselectableTypeError, "You selected a type other than int, float or string")
  else:
    when typ is int:    line.map(parseInt).unpack(count)
    elif typ is float:  line.map(parseFloat).unpack(count)
    elif typ is string: line.unpack(count)
    else: raise newException(UnselectableTypeError, "You selected a type other than int, float or string")

# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
from sequtils import mapIt

let
  N = input(int, 1)
  a = (1..N).mapIt(input(int, 1))

var
  pushed = newSeq[bool](N)
  i = 0
  count = 0
while not pushed[i] and not pushed[1]:
  pushed[i] = true
  i = a[i] - 1
  count.inc

if pushed[1]:
  echo count - 1
else:
  echo -1

Submission Info

Compile Error

Hint: system [Processing]
Hint: Main [Processing]
Hint: strutils [Processing]
Hint: parseutils [Processing]
Hint: sequtils [Processing]
Hint: macros [Processing]
lib/pure/collections/sequtils.nim(591, 11) Hint: 'it' is declared but not used [XDeclaredButNotUsed]
Hint:  [Link]
Hint: operation successful (13899 lines compiled; 1.911 sec total; 15.153MB; Release Build) [SuccessX]

Judge Result