Exactly K Odd Numbers — Solution & Editorial
Exactly K = (at most K) − (at most K−1), each a sliding window counting valid left endpoints per right endpoint.
Complexity: O(N)
Watch out: The count reaches ~5×109 — 64-bit.
Exactly K = (at most K) − (at most K−1), each a sliding window counting valid left endpoints per right endpoint.
Complexity: O(N)
Watch out: The count reaches ~5×109 — 64-bit.