0_0_32291492_30348.cpp:1:1: error: stray '\351' in program
题意 ： 先判断一下图中是否有环，有就直接输出YES，否则在输出这个无环图中的最长链
^
0_0_32291492_30348.cpp:1:1: error: stray '\242' in program
0_0_32291492_30348.cpp:1:1: error: stray '\230' in program
0_0_32291492_30348.cpp:1:1: error: stray '\346' in program
0_0_32291492_30348.cpp:1:1: error: stray '\204' in program
0_0_32291492_30348.cpp:1:1: error: stray '\217' in program
0_0_32291492_30348.cpp:1:1: error: stray '\357' in program
0_0_32291492_30348.cpp:1:1: error: stray '\274' in program
0_0_32291492_30348.cpp:1:1: error: stray '\232' in program
0_0_32291492_30348.cpp:1:1: error: stray '\345' in program
0_0_32291492_30348.cpp:1:1: error: stray '\205' in program
0_0_32291492_30348.cpp:1:1: error: stray '\210' in program
0_0_32291492_30348.cpp:1:1: error: stray '\345' in program
0_0_32291492_30348.cpp:1:1: error: stray '\210' in program
0_0_32291492_30348.cpp:1:1: error: stray '\244' in program
0_0_32291492_30348.cpp:1:1: error: stray '\346' in program
0_0_32291492_30348.cpp:1:1: error: stray '\226' in program
0_0_32291492_30348.cpp:1:1: error: stray '\255' in program
0_0_32291492_30348.cpp:1:1: error: stray '\344' in program
0_0_32291492_30348.cpp:1:1: error: stray '\270' in program
0_0_32291492_30348.cpp:1:1: error: stray '\200' in program
0_0_32291492_30348.cpp:1:1: error: stray '\344' in program
0_0_32291492_30348.cpp:1:1: error: stray '\270' in program
0_0_32291492_30348.cpp:1:1: error: stray '\213' in program
0_0_32291492_30348.cpp:1:1: error: stray '\345' in program
0_0_32291492_30348.cpp:1:1: error: stray '\233' in program
0_0_32291492_30348.cpp:1:1: error: stray '\276' in program
0_0_32291492_30348.cpp:1:1: error: stray '\344' in program
0_0_32291492_30348.cpp:1:1: error: stray '\270' in program
0_0_32291492_30348.cpp:1:1: error: stray '\255' in program
0_0_32291492_30348.cpp:1:1: error: stray '\346' in program
0_0_32291492_30348.cpp:1:1: error: stray '\230' in program
0_0_32291492_30348.cpp:1:1: error: stray '\257' in program
0_0_32291492_30348.cpp:1:1: error: stray '\345' in program
0_0_32291492_30348.cpp:1:1: error: stray '\220' in program
0_0_32291492_30348.cpp:1:1: error: stray '\246' in program
0_0_32291492_30348.cpp:1:1: error: stray '\346' in program
0_0_32291492_30348.cpp:1:1: error: stray '\234' in program
0_0_32291492_30348.cpp:1:1: error: stray '\211' in program
0_0_32291492_30348.cpp:1:1: error: stray '\347' in program
0_0_32291492_30348.cpp:1:1: error: stray '\216' in program
0_0_32291492_30348.cpp:1:1: error: stray '\257' in program
0_0_32291492_30348.cpp:1:1: error: stray '\357' in program
0_0_32291492_30348.cpp:1:1: error: stray '\274' in program
0_0_32291492_30348.cpp:1:1: error: stray '\214' in program
0_0_32291492_30348.cpp:1:1: error: stray '\346' in program
0_0_32291492_30348.cpp:1:1: error: stray '\234' in program
0_0_32291492_30348.cpp:1:1: error: stray '\211' in program
0_0_32291492_30348.cpp:1:1: error: stray '\345' in program
0_0_32291492_30348.cpp:1:1: error: stray '\260' in program
0_0_32291492_30348.cpp:1:1: error: stray '\261' in program
0_0_32291492_30348.cpp:1:1: error: stray '\347' in program
0_0_32291492_30348.cpp:1:1: error: stray '\233' in program
0_0_32291492_30348.cpp:1:1: error: stray '\264' in program
0_0_32291492_30348.cpp:1:1: error: stray '\346' in program
0_0_32291492_30348.cpp:1:1: error: stray '\216' in program
0_0_32291492_30348.cpp:1:1: error: stray '\245' in program
0_0_32291492_30348.cpp:1:1: error: stray '\350' in program
0_0_32291492_30348.cpp:1:1: error: stray '\276' in program
0_0_32291492_30348.cpp:1:1: error: stray '\223' in program
0_0_32291492_30348.cpp:1:1: error: stray '\345' in program
0_0_32291492_30348.cpp:1:1: error: stray '\207' in program
0_0_32291492_30348.cpp:1:1: error: stray '\272' in program
0_0_32291492_30348.cpp:1:1: error: stray '\357' in program
0_0_32291492_30348.cpp:1:1: error: stray '\274' in program
0_0_32291492_30348.cpp:1:1: error: stray '\214' in program
0_0_32291492_30348.cpp:1:1: error: stray '\345' in program
0_0_32291492_30348.cpp:1:1: error: stray '\220' in program
0_0_32291492_30348.cpp:1:1: error: stray '\246' in program
0_0_32291492_30348.cpp:1:1: error: stray '\345' in program
0_0_32291492_30348.cpp:1:1: error: stray '\210' in program
0_0_32291492_30348.cpp:1:1: error: stray '\231' in program
0_0_32291492_30348.cpp:1:1: error: stray '\345' in program
0_0_32291492_30348.cpp:1:1: error: stray '\234' in program
0_0_32291492_30348.cpp:1:1: error: stray '\250' in program
0_0_32291492_30348.cpp:1:1: error: stray '\350' in program
0_0_32291492_30348.cpp:1:1: error: stray '\276' in program
0_0_32291492_30348.cpp:1:1: error: stray '\223' in program
0_0_32291492_30348.cpp:1:1: error: stray '\345' in program
0_0_32291492_30348.cpp:1:1: error: stray '\207' in program
0_0_32291492_30348.cpp:1:1: error: stray '\272' in program
0_0_32291492_30348.cpp:1:1: error: stray '\350' in program
0_0_32291492_30348.cpp:1:1: error: stray '\277' in program
0_0_32291492_30348.cpp:1:1: error: stray '\231' in program
0_0_32291492_30348.cpp:1:1: error: stray '\344' in program
0_0_32291492_30348.cpp:1:1: error: stray '\270' in program
0_0_32291492_30348.cpp:1:1: error: stray '\252' in program
0_0_32291492_30348.cpp:1:1: error: stray '\346' in program
0_0_32291492_30348.cpp:1:1: error: stray '\227' in program
0_0_32291492_30348.cpp:1:1: error: stray '\240' in program
0_0_32291492_30348.cpp:1:1: error: stray '\347' in program
0_0_32291492_30348.cpp:1:1: error: stray '\216' in program
0_0_32291492_30348.cpp:1:1: error: stray '\257' in program
0_0_32291492_30348.cpp:1:1: error: stray '\345' in program
0_0_32291492_30348.cpp:1:1: error: stray '\233' in program
0_0_32291492_30348.cpp:1:1: error: stray '\276' in program
0_0_32291492_30348.cpp:1:1: error: stray '\344' in program
0_0_32291492_30348.cpp:1:1: error: stray '\270' in program
0_0_32291492_30348.cpp:1:1: error: stray '\255' in program
0_0_32291492_30348.cpp:1:1: error: stray '\347' in program
0_0_32291492_30348.cpp:1:1: error: stray '\232' in program
0_0_32291492_30348.cpp:1:1: error: stray '\204' in program
0_0_32291492_30348.cpp:1:1: error: stray '\346' in program
0_0_32291492_30348.cpp:1:1: error: stray '\234' in program
0_0_32291492_30348.cpp:1:1: error: stray '\200' in program
0_0_32291492_30348.cpp:1:1: error: stray '\351' in program
0_0_32291492_30348.cpp:1:1: error: stray '\225' in program
0_0_32291492_30348.cpp:1:1: error: stray '\277' in program
0_0_32291492_30348.cpp:1:1: error: stray '\351' in program
0_0_32291492_30348.cpp:1:1: error: stray '\223' in program
0_0_32291492_30348.cpp:1:1: error: stray '\276' in program
0_0_32291492_30348.cpp:2:1: error: stray '\346' in program
思路分析：判断一个图中是否有环，采用并查集即可，找树上的最长链，也就是树的直径，有两种方法，一种是用采用树形dp,那么树上最长的链就是当前结点最远和次远的儿子加起来的和。
^
0_0_32291492_30348.cpp:2:1: error: stray '\200' in program
0_0_32291492_30348.cpp:2:1: error: stray '\235' in program
0_0_32291492_30348.cpp:2:1: error: stray '\350' in program
0_0_32291492_30348.cpp:2:1: error: stray '\267' in program
0_0_32291492_30348.cpp:2:1: error: stray '\257' in program
0_0_32291492_30348.cpp:2:1: error: stray '\345' in program
0_0_32291492_30348.cpp:2:1: error: stray '\210' in program
0_0_32291492_30348.cpp:2:1: error: stray '\206' in program
0_0_32291492_30348.cpp:2:1: error: stray '\346' in program
0_0_32291492_30348.cpp:2:1: error: stray '\236' in program
0_0_32291492_30348.cpp:2:1: error: stray '\220' in program
0_0_32291492_30348.cpp:2:1: error: stray '\357' in program
0_0_32291492_30348.cpp:2:1: error: stray '\274' in program
0_0_32291492_30348.cpp:2:1: error: stray '\232' in program
0_0_32291492_30348.cpp:2:1: error: stray '\345' in program
0_0_32291492_30348.cpp:2:1: error: stray '\210' in program
0_0_32291492_30348.cpp:2:1: error: stray '\244' in program
0_0_32291492_30348.cpp:2:1: error: stray '\346' in program
0_0_32291492_30348.cpp:2:1: error: stray '\226' in program
0_0_32291492_30348.cpp:2:1: error: stray '\255' in program
0_0_32291492_30348.cpp:2:1: error: stray '\344' in program
0_0_32291492_30348.cpp:2:1: error: stray '\270' in program
0_0_32291492_30348.cpp:2:1: error: stray '\200' in program
0_0_32291492_30348.cpp:2:1: error: stray '\344' in program
0_0_32291492_30348.cpp:2:1: error: stray '\270' in program
0_0_32291492_30348.cpp:2:1: error: stray '\252' in program
0_0_32291492_30348.cpp:2:1: error: stray '\345' in program
0_0_32291492_30348.cpp:2:1: error: stray '\233' in program
0_0_32291492_30348.cpp:2:1: error: stray '\276' in program
0_0_32291492_30348.cpp:2:1: error: stray '\344' in program
0_0_32291492_30348.cpp:2:1: error: stray '\270' in program
0_0_32291492_30348.cpp:2:1: error: stray '\255' in program
0_0_32291492_30348.cpp:2:1: error: stray '\346' in program
R
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