Algorithms Analysis Practice Test 2025 - Free Algorithms Practice Questions and Study Guide

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What does it imply when an algorithm has a space complexity of O(1)?

The algorithm requires minimal space regardless of input size

When an algorithm has a space complexity of O(1), it indicates that the algorithm requires a constant amount of memory space regardless of the size of the input. This means that no matter how large or small the input data is, the space consumed by the algorithm remains the same. This property is particularly advantageous because it suggests that the algorithm is efficient in terms of its memory usage, making it suitable for environments with constrained memory resources.

For example, if an algorithm processes an array but only uses a fixed number of variables to keep track of indices or sums during its computation, its space complexity would be O(1). This ensures that the algorithm's performance is not hindered by the size of the input data, allowing for predictable and efficient memory usage. In contrast, the other options would imply variable or inefficient space utilization which is not the case with O(1) complexity.

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The space requirement grows linearly with input size

The algorithm cannot execute without additional memory

The algorithm is not efficient

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