Copy-avoidance optimizations on Combinatorics#981

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Commits on Jan 19, 2023

Copy-avoidance optimizations
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[ReadOnly]Span does not support iterators. Return arrays instead.
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[ReadOnly]Span is only supported by .Net Core 2.1 and above. Add conditional compilation symbols.
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Commits on Jan 20, 2023

Supports specifying a segment of input or output.
埃博拉酱
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Supports specifying a segment of input or output.
埃博拉酱
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