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# Time complexity
Time complexity describes the run time of an algorithm as a function of the size of the input data.
The direct way to assess the efficiency of an algorithm is measuring the run time. How to accurately measure the run time of an algorithm?
The runtime can intuitively assess the efficiency of an algorithm. How can we accurately estimate the runtime of a piece of an algorithm?
1. **Determining the Running Platform**: This includes hardware configuration, programming language, system environment, etc., all of which can affect the efficiency of code execution.
2. **Evaluating the Run Time for Various Computational Operations**: For instance, an addition operation `+` might take 1 ns, a multiplication operation `*` might take 10 ns, a print operation `print()` might take 5 ns, etc.