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Quick Summary
Match each character in the target string to a unique block that contains it.
Each block can contribute at most one character to the entire target.
Determine feasibility by exploring all valid block-to-character assignments.
What This Tests
Backtracking and recursive state exploration
Constraint satisfaction and matching logic
Preprocessing for efficient lookups
Complexity analysis of combinatorial search spaces
Common Patterns
Backtracking
Depth-First Search
Hashing
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