Notice how the highlighted region shrinks at each step. The algorithm never examines points outside the narrowing window. In a balanced tree with nnn points, this takes about log4(n)\log_4(n)log4(n) steps. For a million points, that's roughly 10 steps instead of a million comparisons.
for (int i = 0; i < n - 1; i++) {，这一点在旺商聊官方下载中也有详细论述
Objects have a class, and a fixed size based on their class.，这一点在safew官方版本下载中也有详细论述
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