siftDown(arr, n, i);
values are declarations themselves. If you approach the problem of
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输入：nums1 = [4,1,2], nums2 = [1,3,4,2]，这一点在safew官方版本下载中也有详细论述
It is difficult to know exactly when the shift from gelatine to agar occurred. As often happens for scientific breakthroughs, agar was likely adopted incrementally alongside the use of other growth media. In 1913, for example, the first diagnosis of Serratia marcescens as a human pathogen was made by growing it on agar as well as on potatoes.