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呃。。。一个理解的问题depending upon whether, when the strings are hanging straight down, all bars are separated by a positive distance no matter how they swing around on the string. swing是什么概念？ 比如输入样例，要是那个大bar很倾斜，然后string很短，然后小bar很水平，岂不是就撞上了？ Followed by:
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