leetCode 52 N-Queens II (Backtracking) | JSer - algorithm and JavaScript

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leetCode 52 N-Queens II (Backtracking)
This is totally the same as previous N-Queen problem, please refer there for more explanation

Hi I'm a JavaScript engineer who is not good at algorithms,
and currently practicing leetCode online. If you are interested, maybe we can learn together.
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when we take N=10 my output shold be 728, this test case not satisfied

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