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Most of Dynamic programming is just a method of reducing computational complexity by changing the noun objects in first-order logic (or second-order logic, advanced version) to walk through the answers of unfinished tasks using completed tasks. Only in very few cases is it necessary to extract and match the completed parts from the unfinished objects in the above process, which often involves optimizing a function f(A,B). However, most of the time, this process is futile.