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Quick Summary
Remove exactly k consecutive elements from an array to balance the sum of values at even and odd indices.
The resulting array must satisfy sum(even_indices) == sum(odd_indices).
Return the smallest starting index of the removed window, or -1 if impossible.
What This Tests
Efficiently evaluating sliding windows using prefix sums.
Handling index parity shifts when subarrays are removed.
Mathematical reasoning regarding cumulative sums and constraints.
Common Patterns
Prefix Sum
Sliding Window
Math
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Input
nums =
k =
Output
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