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求解释啊~我用的是Bellman-Ford算法。看了讨论帖，知道要注意一种货币对自身的汇率问题，然后就在程序里加了一句: if ( str1==str2 && rate!=1 ) 则输出可以…… 为什么这样就错了！！ 我拿着我的程序跟网上搜来的代码对比了很久，把这一句注释掉然后就给AC了…… AC和WA的代码只差这一句的注释所用的两个'/'！！ 狂WA无数次还找不到错在哪儿。。。TAT~ Followed by:
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