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Given a stamp and a target, find a sequence of left indices where placing the stamp on an all-'?' string yields target within 10*n moves, handling overlapping and partial matches. The core challenge is determining a valid ordering of stamp placements (often solved by reversing the process: repeatedly "unstamp" windows that are consistent with the target until fully cleared or no progress is possible).
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Leetcode 936. Stamping The Sequence
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