Submission #2708818

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Source Code Expand

import strutils
import sequtils
import algorithm
import math
import queues
import tables
import sets
import logging
import future

const INF* = int(1e18 + 373)

proc readSeq*(): seq[string] = stdin.readLine().strip().split()
proc readSeq*(n: Natural): seq[string] =
  result = newSeq[string](n)
  for i in 0..<n:
    result[i] = stdin.readLine().strip()

proc readInt1*(): int = readSeq().map(parseInt)[0]
proc readInt2*(): (int, int) =
  let a = readSeq().map(parseInt)
  return (a[0], a[1])
proc readInt3*(): (int, int, int) =
  let a = readSeq().map(parseInt)
  return (a[0], a[1], a[2])
proc readInt4*(): (int, int, int, int) =
  let a = readSeq().map(parseInt)
  return (a[0], a[1], a[2], a[3])

type seq2*[T] = seq[seq[T]]
proc newSeq2*[T](n1, n2: Natural): seq2[T] = newSeqWith(n1, newSeq[T](n2))

#------------------------------------------------------------------------------#
proc countTrailingZeros(x: int): int =
  if x == 0:
    return -1

  var mask = 1
  var count = 0
  while (mask and x) == 0:
    mask = mask shl 1
    count += 1

  return count

proc solve(n: int; a: seq[int]): int =
  var op = newSeq[bool](32)
  for i in 0..<n:
    op[countTrailingZeros(a[i])] = true

  var sum = 0
  for i in 0..<n:
    sum = sum xor a[i]

  var ans = 0
  for i in countdown(31, 0):
    if (sum and (1 shl i)) == 0:
      continue
    if not op[i]:
      return -1
    sum = sum xor ((1 shl (i + 1)) - 1)
    ans += 1

  return ans

proc main() =
  let n = readInt1()
  let a = readSeq(n).map(parseInt)
  echo solve(n, a)

main()

Submission Info

Compile Error

Hint: system [Processing]
Hint: Main [Processing]
Hint: strutils [Processing]
Hint: parseutils [Processing]
Hint: sequtils [Processing]
Hint: algorithm [Processing]
Hint: math [Processing]
Hint: times [Processing]
Hint: queues [Processing]
Hint: tables [Processing]
Hint: hashes [Processing]
Hint: etcpriv [Processing]
Hint: sets [Processing]
Hint: os [Processing]
Hint: posix [Processing]
Hint: logging [Processing]
lib/pure/logging.nim(128, 22) Hint: 'Exception' is declared but not used [XDeclaredButNotUsed]
Hint: future [Processing]
Hint: macros [Processing]
Hint:  [Link]
Hint: operation successful (24859 lines compiled; 2.757 sec total; 24.250MB; Release Build) [SuccessX]

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