a_kawashiro https://blog.hatena.ne.jp/a_kawashiro/ a_kawashiroのブログ https://a-kawashiro.hatenablog.com/ #include <iostream> using namespace std; int main() { int cup[3]; cup[0]=1,cup[1]=0,cup[2]=0; string s; while(cin >> s) swap(cup[s[0]-'A'],cup[s[2]-'A']); if(cup[0]==1) cout << "A" << endl; if(cup[1]==1) cout << "B" << endl; if(cup[2]==1) cout << "C" << endl; return 0; } 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fa-kawashiro.hatenablog.com%2Fentry%2F20110330%2F1301488604" title="AOJ0047 - a_kawashiroのブログ" 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 2011-03-30 21:36:44 rich https://a-kawashiro.hatenablog.com/entry/20110330/1301488604 1.0 100%