POWERFUL SUBSTRING

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Red Skull likes listening to music and (occasionally) reading. No wonder he is especially interested in texts concerning his favourite music. Red Skull calls a string good if it starts with "hail" and ends with "hydra". Finding all good substrings (by substring Red Skull means a subsequence of consecutive characters in a string) in a given text makes our villain especially joyful. Recently he f

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solution.cppC++17

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