Problem Statement
Design a data structure that allows insert, delete and getRandomElement() in constant time i.e. O(1).
Guess item songs from whatsapp emoticons – 5
Number Puzzle #55
IF
6 + 3 = 39
9 + 4 = 513
18 + 16 = 234
Then
6 + 5 = ???
Check your answer:- See Explanation
Its following this logic:
A + B = <A+B>
Thus 6 + 5 = <6-5><6+5> = 111
A + B = <A+B>
Thus 6 + 5 = <6-5><6+5> = 111
implement isPalindrome(int n)
Problem Statement
Implement the function boolean isPalindrome (int n);
Which will return true if the bit-wise representation of the integer
is a palindrome and false otherwise.
8 things most people see daily – Rearrange the letters
These 8 things most people see daily in their life.
Re-arrange the letters to see what it is?
-
- KWOLACLCL
HintWhats the time now?
- KWOLACLCL
Guess the Songs from WhatsApp Emoticons – 4
Guess the pincode
A person forgot his 5 digit pin code, but he remembers some hints.
- 1st digit is square of 2nd digit.
- Sum of 2nd and 3rd digit makes 10.
- 4th digit is 2nd digit+1.
- Sum of 5th and 3rd digit makes 14.
- Sum of all 5 digits = 30
Can you guess the person’s pin code from above hints ?
See Answer
Pin code is 93747.
How?
Lets assume second digit is x, then first digit should be x^2 and fourth digit should be x+1.
How?
Lets assume second digit is x, then first digit should be x^2 and fourth digit should be x+1.
also assume, 3rd digit is y then 5th digit should be 14-y.
So the number will look like this:-
<x^2><x><y><x+1><14-y>
As we also know the sum of all digits, we can say
x^2 + 2x +1 +14 = 30 (x+1)^2 = 16 x+1 = 4 x = 3
As sum of 2nd and third digit is 10 => x+y = 10 => y=7
Thus the pin code is 93747.
Missing numbers in series
missing numbers in the series 4, 10, 22, 46, ?, ?, 382
Find the missing numbers in this series: 4, 10, 22, 46, _____, _____, 382
See Answer
Missing numbers in the series are: 94 and 190.
How ?
Every number in the series is following this pattern
Next number = (previous number)*2 + 2;
How many Squares in this picture #2
You might want to try How many squares – Part 1 before you attempt these 3 puzzles.
1.) How many squares are in this picture ?
How many squares are in this picture
Girl and the box
A girl bought a box when she was 20, She puts $250 in the box on every birthday And her sister takes out $50 from the box on her birthday. Girl died when she was 60 and when the box was opened there were $500 remaining in the box.
How is it possible?
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