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Leetcode 1419. Minimum Number of Frogs Croaking
Given a string formed by interleaving multiple "croak" sequences, determine the minimum number of frogs that must be croaking concurrently to produce it (or return -1 if the letters violate the required "c"→"r"→"o"→"a"→"k" order). The core challenge is tracking overlapping progress through the five ordered states and reporting the maximum number active at once.
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