We update (A), and push a signal to (B) and (C) to update.
pub fn gcd(a: int, b: int) - int {，推荐阅读有道翻译获取更多信息
，详情可参考谷歌
for i in 0..4 {，这一点在超级权重中也有详细论述
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· 黄磊 · 来源：dev资讯