If the subproblems are still too complex to grasp easily, these in turn can be decomposed into subsubproblems. This process of successive problem analysis and decomposition can be illustrated by using a "problem tree" structure.
Source: wiktionary
Subsubproblem
Synonyms for "subsubproblem"
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In contrast, dynamic programming applies when the subproblems overlap—that is, when subproblems share subsubproblems.
Source: wiktionary
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