# Difficult Interview Questions

# 4M

interview questions shared by candidates### How did you design a performance management system? And was it successful? Why or why not?

135 Answers↳

Sorry, I didn't mean to vote this comment down; It was a mistake and can only vote once. Thanks Less

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### Explain reasonable accommodation in regards to the ADA.

51 Answers↳

Hello am here to testify of a great and powerful spell caster. my Wife left me and my two kids for a couple months, I tried to beg her even I called her, she didn't pick up when she came back home the 3rd week she told me she wanted a divorce I was so sad I cried all night he left again I was so lonely the next day I was searching for something online when i found a spell caster called DR ODUDUWA, who have helped so many people with their various issues and problems, so I contacted him with my problems he told me it will take 24hrs and my Wife will be back to me I did everything he told me to do and the next day very early my wife came back kneeling and begging she canceled the divorce we are now happy together all thanks to DR ODUDUWA he can also help you too, contact him directly if you need his assistance on EMAIL....droduduwa2@ gmail.com or whatsapp him +2349019861336 Less

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Hello am here to testify of a great and powerful spell caster. my Wife left me and my two kids for a couple months, I tried to beg her even I called her, she didn't pick up when she came back home the 3rd week she told me she wanted a divorce I was so sad I cried all night he left again I was so lonely the next day I was searching for something online when i found a spell caster called DR ODUDUWA, who have helped so many people with their various issues and problems, so I contacted him with my problems he told me it will take 24hrs and my Wife will be back to me I did everything he told me to do and the next day very early my wife came back kneeling and begging she canceled the divorce we are now happy together all thanks to DR ODUDUWA he can also help you too, contact him directly if you need his assistance on EMAIL....droduduwa2@ gmail.com or whatsapp him +2349019861336 Less

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Hello am here to testify of a great and powerful spell caster. my Wife left me and my two kids for a couple months, I tried to beg her even I called her, she didn't pick up when she came back home the 3rd week she told me she wanted a divorce I was so sad I cried all night he left again I was so lonely the next day I was searching for something online when i found a spell caster called DR ODUDUWA, who have helped so many people with their various issues and problems, so I contacted him with my problems he told me it will take 24hrs and my Wife will be back to me I did everything he told me to do and the next day very early my wife came back kneeling and begging she canceled the divorce we are now happy together all thanks to DR ODUDUWA he can also help you too, contact him directly if you need his assistance on EMAIL....droduduwa2@ gmail.com or whatsapp him +2349019861336 Less

### You have a birthday cake and have exactly 3 slices to cut it into 8 equal pieces. How do you do it?

38 Answers↳

Assuming the cake is square: slice 1: cut horizontally to create 2 equal pieces slice 2: cut vertically to create 4 equal pieces slice 3: line up all 4 pieces of cake side by side and cut horizontally to create 8 equal pieces. don't stack, it will ruin the frosting. Less

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Cut each slice into 3 slices. Then eat one of them.

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Slice it horizontally across the middle creating two equal halves top and bottom. Then simple two slice cross from above like normal. Less

### You have a 100 coins laying flat on a table, each with a head side and a tail side. 10 of them are heads up, 90 are tails up. You can't feel, see or in any other way find out which side is up. Split the coins into two piles such that there are the same number of heads in each pile.

36 Answers↳

Split into two piles, one with 90 coins and the other with 10. Flip over every coin in the pile with 10 coins. Less

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Pick 10 coins from the original 100 and put them in a separate pile. Then flip those 10 coins over. The two piles are now guaranteed to have the same number of heads. For a general solution of N heads and a total of M coins: 1.) Pick any N coins out of the original group and form a second pile. 2.) Flip the new pile of N coins over. Done. Example (N=2, M=6): Original group is HHTTTT (mixed randomly). Pick any two of these and flip them over. There are only three possible scenarios: 1: The two coins you picked are both tails. New groups are {HHTT} {TT} and when you flip the 2nd group you have {HHTT} and {HH}. 2.) The two coins you picked consist of one head and one tail. New groups are {HTTT} and {HT} and when you flip the 2nd group you have {HTTT} and {TH}. 3.) The two coins you picked are both heads. New groups are {TTTT} and {HH} and when you flip the 2nd group you have {TTTT} and {TT}. Less

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reading these answers is such a confidence builder.

### How would you handle a situation where you have a client who interrupt your existing interaction with a client?

23 Answers↳

I politely tell the client who interrupted to please standby and that I will be able to answer their questions/handle their issues shortly. If they need immediate attention I will call a member of the team to assist. Less

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I apologize and ask him or her to please step in line and I’ll be right with them. If they interrupt I say understand completely and look for a manager. If there isn’t one available, I’d ask for the source of their urgency. If it’s just them being difficult without an interest in telling me their issue I’d tell them I’ll be with them shortly, I just have to help another customer. Really it helps to keep things short and simple, moving along as quickly as possible with other tasks at hand. Less

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Jessica Cross

### An array of 99 elements contains integers from 1 to 100 with one missing element. Find the missing element.

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1. calculate the sum of elements in array say SUM 2. sum of numbers 1 to 100 is(n* (n+1))/2 = 5050 when n==100 3. missing element is (5050-SUM) Less

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Sum them and then subtract them from 5050. In general, if an array of size n - 1 elements has unique elements from 1 to n, then the missing element can be found by subtracting the sum of the elements in the array from sum(1 ... n) = n * (n + 1) / 2. Alternately, one could use a boolean array of length n with all values set to false and then for each value, set array[val - 1] to true. To find the missing value, scan through the array and find the index which is set to false. Return index + 1. This requires O(n) memory and two passes over an O(n) array (instead of constant memory and one pass), but has the advantage of actually allowing you to verify whether or not the input was well formed. Less

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Read the question. Here are the steps to solve it: 1) find the sum of integers 1 to 100 2) subtract the sum of the 99 members of your set 3) the result is your missing element! Very satisfying! Less

### Find the second largest element in a Binary Search Tree

15 Answers↳

The above answer is also wrong; Node findSceondLargest(Node root) { // If tree is null or is single node only, return null (no second largest) if (root==null || (root.left==null && root.right==null)) return null; Node parent = null, child = root; // find the right most child while (child.right!=null) { parent = child; child = child.right; } // if the right most child has no left child, then it's parent is second largest if (child.left==null) return parent; // otherwise, return left child's rightmost child as second largest child = child.left; while (child.right!=null) child = child.right; return child; } Less

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find the right most element. If this is a right node with no children, return its parent. if this is not, return the largest element of its left child. Less

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One addition is the situation where the tree has no right branch (root is largest). In this special case, it does not have a parent. So it's better to keep track of parent and current pointers, if different, the original method by the candidate works well, if the same (which means the root situation), find the largest of its left branch. Less

### The manager of component 'A' says his functionality is more important than that of component 'B.' The manager of component 'B' says his is more important than that of component 'A.' You can only implement one A or B, but not both - which do you choose to implement.

14 Answers↳

The key question to ask is definition of "IMPORTANT". Is it important to the managers (ego equation), important to the end consumer or important for Amazon. The first one needs to be thrown out immediately and the others must be quantified based on achievability, impact on end user and ROI. Less

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I would say whichever is more valuable to customer & gives competitive advantage to Amazon. Less

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In addition to the above suggestions, I would look at cost and time to market and then score both options. Then define value metrics. The cheapest and most valuable either as a technology sustainer or for customer wins. Given that it's Amazon, customer value will hold up the highest as one of their corporate culture virtues. Less

### You are in a boat in a pool with a rock in your hand. You throw the rock into the pool. Does the water level rise, drop, or stay the same?

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If the rock were neutrally buoyant the water level would remain the same. It is heavier than water which causes it to displace more than its own volume while in the boat compared to at the bottom of the lake. Therefore the water level of the lake would go down. Less

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These answers are troubling. The only correct answer so far is Ben. The water level goes down. Less

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The weight of the boat plus you plus the rock has already displaced the height of the water. The only time the water level will change will be when the rock is mid air. Less

### 50,000 shoppers with a 0.5% conversion rate for a chair that costs $250. Wayfair makes a 27% profit. Next, 50,000 shoppers will get a 10% discount. What is the conversion rate they must achieve to achieve the same profits as before?

13 Answers↳

This is incorrect Old revenue = 50000*250*.005=250*250 New revenue with conversion rate r% = 50000*r*250*.9 = old revenue = 250*250 r = .55% Less

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July 9 is wrong because the profit margin changes(As sale price changes, but the cost doesn't change) Less

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The new conversion rate is 0.944, Profit from case 2 = $16,875 and the third part, if this scenario actually occurred I would give a 10% discount (with the new conversion rate .944%) because the overall profit margin would remain same i.e. $16,875 Less