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JZOJ 5670. 【GDSOI2018模拟4.19】树
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给定一棵 n 个点的树,每条边有个正整数边权。有 q 次修改操作,每次会修改一条边的边权。 在所有修改前以及每次修改后,你需要求出有多少个无序点对满足它们之间的最短路径上所有边权的最大公约数1。
解法
最大公约数1看似很恶心。 …
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HDU5670 Machine【进制】
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