Machine Input Output Tricks & Tips - Part 1


Machine Input Output Tricks & Tips

Input Output is one of the easiest topic of Reasoning ability section in Exams. You just need to give in a little hard work and you’ll be able to score marks easily in this topic. Today, we will discuss about this topic in depth and the types of questions that you may come across.

Types of Machine Input Output :

  1. Ordering
    • Alphabets(Forward/Reverse order)
    • Numbers(Ascending/Descending order)
  2. Shifting / Interchanging
    • Single Side Shifting
    • Double Side Shifting
  3. Mathematical Operations
    • Shifting with the help of Numbers

Machine Input/Output Solving Steps –

  1. First off – don’t look at an I/O question and skip it! It maybe an easy one.
  2. Look at the Input – see what you are up against. Only words/alphabets or only numbers or alpha-numeric combination.
  3. Then ignore every step and go straight to the last step – now concentrate how they’ve finally arranged the input.
  4. Usually the kind of arrangements we’d find are:
    (i) if only numbers – then in ascending or descending.
    (ii) words – A-Z or Z-A and as per dictionary! (pop – pope – popped!)
    (iii) alpha-numeric – is jumbled in that case you may have all the numbers together in the beginning or at the end, in ascending or descending;
    the words in the beginning or at the end, in A-Z or Z-A;
    you may have a number and a word in alternating pattern, where – the numbers will ascend or descend – and the words will have their own A-Z/Z-A pattern!
  5. Whatever the pattern is – look at the last step and form an idea in your mind – ‘okay, so numbers first and then the alphabets all in descending/Z-A – fine! Got it!’
  6. Then look at the first step – and identify – how they have started out with the arrangement.Are they taking a number first? If so highest or lowest number?Is the number introduced in the step from the front of the sequence or from the last?Same thing will apply to words too.
  7. You will usually require taking note of 3-4 steps to fully identify the pattern and then you can begin with your own solving. (Don’t waste time copying the steps of the question from the screen! Does anyone do that?)
  8. Note! When you have words arrangement – don’t waste time writing the entire words in your rough sheet – use only the first alphabets, and where there is more than one same first letter, then use the word’s second/third letter to differentiate.Example:Input : Risk Crab Apple Zombie Home Sailor Rikshaw
    Step 1: Risk Crab Apple Home Sailor Rickshaw Zombie
    Step 2: Risk Crab Apple Home Rickshaw Sailor Zombie
    and so on …you can write it as:
    Step 1: Ris C A H S Ric Z
    Step 2: Ris C A H Ric S Z
  9. For question where they give a separate set of Input for every sub-question and asks you to identify if it is ‘Step III’? – Or, asks you to give the number of steps required to solve a particular input sequence – my sincerest and honest advice is – quickly solve it!There will be 100% chance of you being correct!

In this type of problems, we usually shift the given words (or numbers) of the given input as per fixed pattern. Generally letters and numbers are placed in ascending or descending order, one at each step. The following example shows how this is done:

For e.g. –
Input: Ram person is a great

Step I: a Ram person is great
Step II: a great Ram person is
Step III: a great is Ram person
Step IV: a great is person Ram
Step IV is the last step.

In the above arrangement, in each step one word is arranged one step at a time from left to right in ascending alphabetical order.

In this type of questions, the words or the numbers are arranged as per a fixed order. The pattern of ordering could be:
  1. Alphabetical in case of words.
  2. Increasing or decreasing in case of numbers.
  3. According to number of consonants or vowels in each word.
  4. According to the words beginning with consonants or vowels.
  5. According to even numbers or odd numbers.
        The arrangement types of questions also consist of various types of categories such as; Single shifting arrangement, Double Shifting arrangement.

        1. Single shifting arrangement

        In single shifting arrangement, one word or numbers are arranged either in a left or right side in each step. The process continues till the last steps. For e.g:
        Input: 22 care 59 never 87 sold 15 land house 43

        Step I: care 22 59 never 87 sold 15 land house 43
        Step II: care 15 22 59 never 87 sold land house 43
        Step III: care 15 house 22 59 never 87 sold land 43
        Step IV: care 15 house 22 land 59 never 87 sold 43
        Step V: care 15 house 22 land 43 59 never 87 sold
        Step VI: care 15 house 22 land 43 never 59 87 sold
        Step V: care 15 house 22 land 43 never 59 sold 87
        Step V is the last step of the given input.

        After observing the arrangement, we can conclude that in first step; word is arranged in left side in ascending order and in second step number is arranged in left side in increasing order. The process continues till the last step.
        Special Note: After arranging word “house” in step III our next arrangement will be “22”, but is already come in its place without arranging, so we will not count 22 in our next step and move to word “land” which will be arrange step IV.
        The same case is repeated in step VI, after arranging the word “never” our next arrangement will be “59”, but is already come in its place without arranging, so we will not count 59 in our next step and move to word “sold” which will be arrange step V.

        2. Double shifting arrangement

        In double shifting arrangement, two words (or numbers) are arranged either in a left side or right side in each step. The process continues till the last steps. For e.g:

        Input: more 40 great and 60 74 will

        Step I: 74 more 40 great 60 will and
        Step II: 74 60 more 40 will and great
        Step III: 74 60 40 will and great more
        Step IV: 74 60 40 and great more will
        Step IV: is the last step of the arrangement of the above input as the intended rearrangement is obtained.

        After observing the arrangement, we can conclude that in each steps; the numbers are arranging in decreasing order on the left end and words are arranging in alphabetic order on the right end. The process continues till the last steps.
        Special note: In arrangement problems, we cannot find previous step. If Step IV or Step V is given and in question and it was asked to find the previous step, we cannot find it. So, our answer will becannot determined.

        Points to Remember

        For arranging the logic of arrangement you are advised to follow a certain things.
        Have a glance at the first and the last step. This will give you a rough idea of what really happened in between the steps.
        1. Have a quick glance at every step to know how this is being carried out.
        2. Rearrange the given input step by step or if required move from final step to the input.


        Machine information or Input Output is an inquiry sort, where the applicant is given some sort of word and number course of action. With each ensuing operation, the course of action of the words and numbers changes. These operations are performed until a last course of action is come to or is performed in circle. The understudy is required to distinguish the shrouded design in the improvement and apply it to the inquiries.

        1.A word course of action machine when given a contribution of words, improves them taking after a specific tenet in every progression. The accompanying is an outline of information and steps revamp.

        This is the last plan and STEP IV is the last stride for this information.
        What ought to be the last stride of the accompanying info?

        INPUT: Coal Steer Brief Nap Blast Cry
        Clarification: The given revamp has an example that can be taken after from the info venture to the last stride, which is Step IV. Watch painstakingly. The modification takes after the accompanying examples:

        1. The revamp is occurring from left to right.
        2. The revamp is occurring single word at once.
        3. The revamp is done on the premise of diminishing alphabetic request.

        NOTE: To comprehend the example, regularly it is adequate to take a gander at the info, first, second and last strides of the course of action.

        Presently on the off chance that we apply the same example tenets to the second information given, we can promptly tell what the yield (last stride after adjustment) would be:

        Input:      Coal      Steer    Brief    Nap     Blast     Cry
        Output:    Steer    Nap     Cry      Coal      Brief     Blast


        This was a basic illustration including just words. A few inquiries accompany just numbers. Others come as a blend of words and numbers. More entangled ones may even include images. In any case, for the Bank PO exams, it is critical to focus on the inquiries that are blends of words and numbers.
        In view of the rationale utilized behind the reworking, we can characterize these sorts of inquiries as:

        A. Modifications in light of Ordering:

        Words are organized sequentially (forward or switched) according to their positions in the lexicon while numbers are orchestrated in rising/diving request.
        Both words and numbers could be masterminded independently or at the same time in every progression. The reworking can begin from the furthest left side or the furthest right half of the sentence and now and then even at the same time from both the closures. The improvement could either begin with a word or a number. Whatever the better points of interest might be, in these sorts of modifications, maybe a couple words/numbers are moved at once, without changing the request of the rest of the words/numbers.

        Here, Step III is the last stride and the revision is done at the same time from both front and back closures. The adjustments are done in this way: the numbers are organized in climbing request one by one from the left end, with the following greatest number being added to one side of the past number. The words are organized in diving request one by one from the right end, with the last word in the lexicon heading off to the furthest right end, and prior sections in the word reference getting included ensuing strides to one side of that word.

        B. Modifications in view of Interchanging the Positions of Words and Numbers:

        Particular positions are chosen and the positions of just those words/numbers are traded. The positions of all others stay unaltered.

        Step VII is the last stride of the info. The underlined words are utilized to demonstrate the words that will be exchanged in the each ensuing stride.

        C. Modifications taking into account Mathematical operations:

        Some scientific operation (like squaring the number, including the digits inside the number, some basic number included/subtracted/duplicated/partitioned to every number and so forth.) is connected on the numbers in every progression.
        Step III is the last stride. Plainly in this case, the unit’s digits of the left most and right most number are all the while being subtracted from the numbers themselves. This is trailed by the number to one side of the left most one, and to one side of the privilege generally one.


        1.If there are “n” words/digits in the information then at most ‘n-1’ stages are required to modify it totally.
        2.Number of words/digits orchestrated until the present stride is more prominent than or equivalent to the present stride number.
        3.If info is not given we can’t decide the past stride from given stride number or we can’t decide contribution from given stride number.

        Step by step instructions to SOLVE

        These inquiries can be settled by the accompanying techniques:
        1. We can settle these inquiries by composing every progression of the given contribution on paper.
        Keep in mind – don’t compose the complete word every time; to spare time, simply compose the main letter or however numerous letters of every word you have to remarkably recognize it.

        INPUT:    32    immaculate     young     lady     excellent    49    63    78    arbitrary   rickshaw
        Output:   32     P                        G             B           49              63     78     Ra     Ri

        2. We could go for a shorter technique where as opposed to composing every progression over and over we number every word/number of the contribution according to their position in every progression. So if the game plan takes after a “number-sliding from-left-and-letters-climbing from-right-then again design”, we have to number these as takes after:


        Obviously the example is, ‘send the greatest number left’. In the following stride, send the most elevated word right. Proceed with the example till the information is totally revamped.
        To minimize the strides, let us take a gander at all the components on the premise of their positions. We just need to see the initial two stages and the yield to make sense of which number/word goes where. The request in which the component gets revamped is the number every component gets.

        INPUT:     32  unadulterated young lady wonderful 49 63 78 rickshaw irregular
        OUTPUT: 7 6            8                 9         5      3               1    2      4

        Since “78” is the principal component that will be revised by example, it will be marked 1. The following component to be modified will be ‘rickshaw’. So it will be marked 2. The following component to be modified will be the following most elevated number. So without working out the rest of the strides you could mark “63” as 3. What’s more, comparatively “arbitrary” would get to be 

        4. Et cetera.
        While revising by this strategy, remember the accompanying four cases:

        Case 1: When we go in single bearing, i.e. words/digits are organized either from left to right or right to left. For this situation, auto filling of words/digits could occur on the grounds that a few numbers/words organize themselves. So how would we number our components for this situation? For accommodation’s purpose, let us think about every one of the components being orchestrated left to right.
        1. Number every word/number in the way appeared above according to their request of course of action as per the example portrayed in the inquiry. Consider it an orderly procedure. After every numbering, you have to stop and check.
        2. After you recognize the primary component, number it (1). At that point distinguish the second component. Check every one of the components to one side. Have you numbered every one of them yet? On the off chance that yes, then number this one (1a). If not, then number it (2). At that point distinguish the third component. Check every one of the components to one side. Have you numbered every one of them yet? On the off chance that yes, then this doesn’t get another progression number. Assuming no, then it gets a new stride number. What’s more, the procedure proceeds. Here is a delineation.


        Step VII is the last stride of the info

        Q. Taking after the above example, what number of steps will be required to finish the game plan for the beneath given info?
        INPUT:    84 out sown even 35 54 around 46

        Contribution: In the given delineation, the words/digits are being organized in the accompanying way: the most reduced digit is masterminded at furthest left of the sentence and all others are moved to the right side as it is and in second step, most astounding expression of lexicon is orchestrated right of the beforehand organized number etc. The following higher digit and next most elevated word is orchestrated in consequent pair of steps.
        Here is the way you would number these components. Note that underlined components speak to those ones to one side that you haven’t numbered yet.


        Here, 6a and 6b are not given further values at the season of filling, as all components to one side of these two have been filled as of now. Consequently, these two elements are masterminded naturally in step 6. Moreover, step 6 is the last stride of the info, so six stages are required to finish the game plan.

        NOTE: Now whichever step is asked in the inquiry, take the part of the arrangement up to the required stride number to get the answer. Organize the numbered components as per their marks, and move the staying to one side, while leaving their request unaltered.

        NOTE:  If the revamp is to be done from the privilege, the way toward checking would be turned around. Presently as opposed to checking to one side, you would need to check to one side to check whether there are any unnumbered components.

        Case 2: When we go in both bearings, with components filling in from within, auto filling could in any case happen. So we have to check when numbering. In view of which heading the component goes, it is numbered with a L (left) or a R (right) joined to it. While considering things marked with L, verify whether there are any unlabeled components to one side and while considering things named with R, verify whether there are any unlabeled components on its right side.
        Step III is the last stride of the reworking.

        Q. Taking after the above example, what number of steps will be required to finish the course of action for the beneath given information?
        INPUT: goat out 34 59 set 75 peon 28
        Info: The improvement obviously happens from both headings all the while, however from within. The way that the reworking is going on from within has a colossal effect. The numbers are masterminded in rising request from the left and the words are organized in dropping request of their appearance in the lexicon, however from the privilege.
        Here is the way you number these components. Note that underlined components speak to those ones to one side of the “L” components that you haven’t numbered yet. What’s more, the stressed components speak to the ones to one side of the “R” components that you haven’t numbered yet.
        Presently, it is anything but difficult to answer the inquiry taking into account the numbering. The answer is three stages.

        Q. Taking after the above example, what will be the second step after adjustment for the beneath given info?
        goat out 34 59 set 75 peon 28
        The underlined components speak to the rest of the components unaltered all together.

        Case 3: When we run in both headings with components filling in all things considered, i.e. we put digits/numbers left to one side most word/right to the privilege generally word. For this situation, no auto filling of digits/numbers happens i.e. every word is numbered independently. Remember the accompanying:
        1.Number of sets of words/digits is equivalent to the quantity of steps.
        2.Identify the example in the info improvement. At that point number the components going left in their example request with 1L, 2L, 3L et cetera. What’s more, number the components going right in their example request with 1R, 2R,3R et cetera.
        3.There is no auto filling, so there is no compelling reason to check regulated. The numbering should be possible in one go.
        STEP V is the last stride of the information.
        Q. Which is the fifth letter from right side in step V of the accompanying information?
        INPUT: 87 when show 14 35 new beat ink 51 28
        Output: 5L 5R 4R 1L 3L 3R 1R 2R 4L 2L
        Solution: In the given delineation, the words/digits being masterminded in the accompanying way: in the initial step, least digit and most reduced word in lexicon are put at left most and right most side individually, of the string and all different elements are put as it seems to be. At that point in the second step, next most minimal digit and word are orchestrated to one side and right of the beforehand masterminded digit and word at the same time et cetera. In this manner, game plan is from left to left + right to right.
        Here L1, L2 so on are utilized to speak to left side and R1, R2 so on to speak to right side.
        Henceforth step 5 of the info is
        Step 5: 87 51 35 28 14 beat ink new show when
        So fifth from the right side is “beat”
        NOTE: For this situation fifth from right is not R5, but rather R1. So be cautious while noting this kind of inquiry. Check in reverse from the most astounding number mark of that progression in such cases.

        Case 4: In blended structure i.e. both case 1 and 2 are utilized as a part of one info then both the standards are utilized for every side
        NOTE: If matching of words and digits/words and words/digits and digits is watched i.e. both are put all the while in every progression and in the event that on the off chance that one is auto filled and other is not then no progression is skipped.

        Its a gift to have these Time sparing short Tricks for Input Output in Reasoning exactly when the exam is only few days away. Offer this information with your kindred mates and let them likewise profit by the same.

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