解説AC 一問に2時間以上かけるのやめてぇ atcoder.jp http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=1124 http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=1125 http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=2738 htt…