Ozy https://blog.hatena.ne.jp/Ozy/ カメヲラボ https://ozy4dm.hateblo.jp/ PKU2301 http://acm.pku.edu.cn/JudgeOnline/problem?id=2301 いずれ（略 main(s,d,k){ for(gets();~scanf(k="%d %d\n",&s,&d); printf(s<0|s%2?"impossible\n":k,s+d,s/=2))s-=d; } 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fozy4dm.hateblo.jp%2Fentry%2F20060916%2Fp4" title="最短（略 - カメヲラボ" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2006-09-16 00:00:03 rich https://ozy4dm.hateblo.jp/entry/20060916/p4 1.0 100%