<p>CMU CS is a very selective group, I'd doubt they'd apply to Harvard as much as they do to MIT, Cal tech, Berkeley, and Stanford.</p>
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The exceptions would be kids at Yale, Princeton, MIT and Stanford, that's about it.
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<p>Actually, a significant majority of cross-admits choose Harvard over Yale and Princeton. I think the only exceptions would be MIT and Stanford, due to their strong science and engineering departments, and perhaps some specialized programs like Brown's PLME and Northwestern's HPME.</p>