What is a characteristic of an efficient algorithm?

An efficient algorithm is characterized by its ability to perform a task with minimal resource consumption. This includes using the least amount of time, memory, and computational power necessary to complete a given problem. An efficient algorithm not only aims for optimal performance but also seeks to maximize productivity while minimizing waste.

For example, in sorting algorithms, efficiency can be measured by how quickly the algorithm can sort the data set. An efficient sorting algorithm will sort large lists more quickly than a less efficient one, which directly influences the resources consumed in terms of time and processing power.

In contrast, other characteristics mentioned like avoiding data manipulation do not contribute to the efficiency of an algorithm. Lengthy and complex algorithms can often lead to greater resource usage, while reliance on manual input can result in increased error rates and inefficiency in processing data automatically. Therefore, the focus on minimal resource usage aligns perfectly with the definition of an efficient algorithm.