Percentages
A number is increased by 20% and then decreased by 20%. Net change?
Interview prep
TCS NQT
Aptitude patterns and coding discussion prompts typical of NQT and service-company first rounds. Pair this with DSA practice three times a week.
Aptitude
12Time & Work
A finishes in 10 days, B in 15. Together how many days?
Number series
2, 6, 12, 20, 30, ?
Profit & Loss
CP=500, SP=575. Profit %?
Ages
Father is 3 times son. In 12 years he will be twice. Son's present age?
Simple Interest
P=1000, R=10%, T=2 years. SI?
Ratio
A:B = 2:3, B:C = 4:5. A:C?
Average
Avg of 5 numbers is 20. If one number 30 is replaced by 40, new avg?
Pipes
Pipe A fills in 6h, B empties in 8h. Together fill time from empty?
Probability
A fair die. P(prime number)?
Blood relations
A is B's brother. C is A's mother. D is C's father. How is D related to B?
Coding-decoding
If CAT = 24, DOG = 26, what is BAT?
Coding prompts
6Reverse digits
Write C++ logic to reverse digits of an integer without using strings. Discuss overflow.
Frequency of characters
Given a lowercase string, explain O(n) approach to print frequency of each character.
Prime check
Optimize isPrime(n) better than checking all numbers till n-1. What is complexity?
Palindrome number
Check if an integer is palindrome without converting to string. How?
Second largest
Find second largest in array in one pass. Edge cases?
Anagram check
Are two strings anagrams? Give O(n) approach in C++.