Practice Problems

Some Common Pre-Computation Techniques used on Array:

Problem	Difficulty
Queries for the product of first N factorials	Easy
Range sum queries without updates	Easy
Range Queries for Frequencies of array elements	Easy
Count Primes in Ranges	Easy
Check in binary array the number represented by a subarray is odd or even	Easy
GCDs of given index ranges in an array	Easy
Mean of range in array	Medium
Difference Array \| Range update query in O(1)	Medium
Range sum query using Sparse Table	Medium
Number whose sum of XOR with given array range is maximum	Medium
Number of primes in a subarray (with updates)	Medium
Sum of Interval and Update with Number of Divisors	Medium
Print modified array after multiple array range increment operations	Medium
Sparse Table	Hard
Range Minimum Query (Square Root Decomposition and Sparse Table)	Hard
Range Query on array whose each element is XOR of index value and previous element	Hard
Queries for GCD of all numbers of an array except elements in a given range	Hard
Queries of nCr%p in O(1) time complexity	Hard

PreComputation Technique on Arrays

Precomputation refers to the process of pre-calculating and storing the results of certain computations or data structures(array in this case) in advance, in order to speed up the execution time of a program. This can be useful in situations where the same calculations are needed multiple times, as it avoids the need to recalculate them every time.

This technique relies on fast retreival of already stored data rather than recalculation.

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#Arrays #DSA #Arrays

Some Common Pre-Computation Techniques used on Array:

Practice Problems

PreComputation Technique on Arrays

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