https://v.qq.com/txp/iframe/player.html?vid=v0510kl2jx4&width=500&height=375&auto=0
间隔排列—栽树问题
https://v.qq.com/txp/iframe/player.html?vid=k05251sro66&width=500&height=375&auto=0
复杂的间隔排列
https://v.qq.com/txp/iframe/player.html?vid=l0531ef2675&width=500&height=375&auto=0
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