circular array hackerrank solution in python
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in this tutorial, we'll discuss how to solve the "circular array rotation" problem on hackerrank using python. the problem requires us to rotate an array of integers a certain number of times and then answer queries about elements in the rotated array.
given an array a of n integers, and an integer k, perform k right circular rotations on the array. then, for each integer m in a list of queries, print the value of the element at index m after all rotations.
for example, if the original array is a = [1, 2, 3], k = 2, and the queries are [0, 1, 2], then the output should be [2, 3, 1].
to solve this problem efficiently, we can use the concept of modular arithmetic. since the rotations are circular, we can determine the new index of an element after rotation by simply taking the modulus of the new index with the length of the array. this prevents us from actually performing the rotations, which can be inefficient for large arrays and a large number of rotations.
in this code:
this solution has a time complexity of o(n + q), where n is the length of the array a and q is the number of queries. since we're not actually performing the rotations but instead using modular arithmetic, it's efficient even for large arrays and a large number of rotations.
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