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Simulate a directional jump sequence on a 1D array where each leap depends on an alternating direction and a target height condition.
Identify the nearest valid landing index in the current direction without scanning the entire array repeatedly.
Return the final index where the traversal halts due to an unmet target or boundary constraint.
What This Tests
Array simulation and mutable state management
Efficient neighbor/value lookups using precomputed mappings
Binary search application on sorted index collections
Algorithmic optimization beyond brute-force traversal
Common Patterns
Simulation
Hashing
Sorting
Binary Search
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Input
nums =
index =
x =
Output
Expected
