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终于知道为什么不可以用A*了一开始没想到什么好的方法，于是就用做类似k短路（2449）时的A*，但是发现总是MLE。于是去网上搜了一个解题报告，AC了后再来测试，发现此题的答案会超过10^8，如此之大的数量级，优先队列就把内存撑破了，而2449中则有限制k<=1000，所以不会MLE。～～菜鸟的想法。 Followed by:
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