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  1. Practice
  2. Data Structures
  3. Arrays
  4. Arrays - DS
  5. Discussions

Arrays - DS

  • satishbabuoffice + 6 comments

    Single line code in JavaScript

    console.log(arr.reverse().join(' '));

    • pminkov + 0 comments

      Nice!

    • alxcherepanov + 3 comments

      Nice, it seems, you forgot another 28 lines of parsing.

      That's what I call one line:

      #!/usr/bin/env ruby

gets && (puts gets.split.reverse.join(' '))
      • nyos22 + 6 comments

        2 lines in python, just because of n...

        input()
print(" ".join(str(x) for x in reversed(list(map(int, input().strip().split())))))
        • csixteen + 3 comments

          You can simplify your Python code:

          input()
print(" ".join(input().split(" ")[::-1]))
          • artgromov + 1 comment

            i think you forgot about number of digits to print (N)

            • csixteen + 1 comment

              Not necessary. I just take whatever comes as the second input, create a list from it, reverse it and print the elements glued with a space.

              • KeyurPotdar + 1 comment
                [deleted]
                • msmsinghchauhan + 1 comment

                  Your code didn't work. 

                  >> print(input()==0 or " ".join(input().split()[::-1]))
10 20 30 40
50
50
                  • a_kamal_89 + 0 comments

                    I guess that you forgot to press Enter after the first integer input.

          • aliciali + 3 comments

            This works too.

            n = int(input())
print(*list(input().split())[::-1])
            • shaurya2us + 1 comment

              What language is this? (Python or C++)

            • duy_tha304 + 1 comment

              Hello I'm new to python so could you please explain the * and [::-1] in the second line,please?

              • msmsinghchauhan + 1 comment

                • will unpack a list. eg:

                  A=[1,2,3] print(*A) 1 2 3

                Please refer

                we use [::] to slice. refer http://pythoncentral.io/how-to-slice-listsarrays-and-tuples-in-python/

                eg: If we want to get a sliced list in reverse order.

                print(A[::-1]) [3, 2, 1]

                • duy_tha304 + 0 comments

                  Okay,got it.Thank you so much

            • armyindiabts + 0 comments

              can u explain why u put * beforew list?

          • lorentz_dll + 0 comments
            [deleted]
        • KeyurPotdar + 0 comments
          [deleted]
        • an0o0nym + 2 comments

          one-liner

          print(*[input().split() for _ in range(2)][1][::-1])
          • shaurya2us + 1 comment

            What language is this?

            • anirudhsingla8 + 0 comments

              python

          • vasanthmsvs + 0 comments

            can u xplain this plz..

        • jacky_xue_ds + 0 comments

          It doesn't work. No reponse output

        • jhrozo + 1 comment
          ## yet simplier, python has it all !!

print(*arr[::-1])
          • rojastorrado + 1 comment

            The idea is make and understand what's happening behind scenes.. Make the algorithm.

            • jhrozo + 2 comments

              Ok, here is the explanation. The simple print(*arr[::-1]) is equivalent to:

              output_str = ""
inverse_array = arr[::-1]
for element in inverse_array:
    output_str = output_str + " " + str(element)
print(output_str)

              This is why Python has it all.

              • dgaban + 0 comments

                lol. the challenge is to make the reverse algorithm yourself. you're still relying on just using arr[::-1] instead of actually writing that algorithm yourself.

              • nayak628 + 0 comments

                but it is still showing the same error before using this code Traceback (most recent call last): File "solution.py", line 31, in fptr.write(' '.join(map(str, res))) TypeError: 'NoneType' object is not iterable

        • gurneeshchahal09 + 0 comments

          return a[::-1]

      • yuki_ + 0 comments

        Not as simple as yours, but how about this?

        console.log(require('fs').readFileSync('/dev/stdin', 'utf8').split('\n')[1].split(' ').reverse().join(' '));
      • ltrico59 + 0 comments
        [deleted]
    • CSharpDev + 1 comment

      One-liner in C# too: 

      Console.WriteLine(string.Join(" ", arr.Reverse()));
    • vasilij_kolomie1 + 0 comments

      really? do You like Python now?

      def reverseArray(a):
      return a[::-1]

      really 8 symbols...

    • afshan_shokath + 0 comments

      Gives me runtime error. Everything i write gives runtime error.

    • rodrigzer + 0 comments

      I did the same but it throws an error.