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algorithm efficiency A measure of the average execution time necessary for an algorithm to complete work on a set of data. Algorithm efficiency is characterized by its order.
One way to measure the efficiency of an algorithm is to count how many operations it needs in order to find the answer across different input sizes.
Empirical measurements
The number of operations does not tell us the amount of time a computer will take to actually run an algorithm. The running time depends on implementation details like the speed of the computer, the programming language, and the translation of the language into machine code. That's why we typically describe efficiency in terms of number of operations.
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