throw exceptions if the titles of sample cases are abnormal #620
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fix #615
サンプルの解析の際に
<h3>Sample Input 2</h3>
みたいなところを見て警告を出しているのですが、これを警告でなくエラーにします。#615 の例を完全に解析しきるのは無理 (できたとしても HTML parser の実装に強く依存してしまうのでどうせすぐ壊れる) ですので、これは諦めます。しかし、まずいのはエラーにならず正常終了してしまうことなので、このプルリクによって #615 が解決されます。