{"image_url":"https://chart.apis.google.com/chart?cht=tx&chl=%20h%20%3D%20%5Csum_%7B0%20%5Cle%20k%7D%20D_k%28f%29%20D_k%28g%29%20%2F%20k%21","categories":[],"provider_name":"Hatena Blog","author_url":"https://blog.hatena.ne.jp/ngtkana/","description":"\u30b3\u30f3\u30c6\u30b9\u30c8\u30da\u30fc\u30b8 AtCoder Regular Contest 101 - AtCoder \u89e3\u6cd5 \u2714 D - Median of Medians\uff08700 \u70b9\uff09 \u7b54\u3048 X \u3092\u4e8c\u5206\u63a2\u7d22\u3067\u3059\u3002\u4e2d\u592e\u5024\u304c X \u4ee5\u4e0a\u3067\u3042\u308b\u533a\u9593\u306e\u500b\u6570\u304c ceil(\u533a\u9593\u306e\u7dcf\u6570 / 2) \u4ee5\u4e0a\u3067\u3042\u308b\u6700\u5927\u306e X \u304c\u7b54\u3048\u3067\u3059\u3002 \u4e2d\u592e\u5024\u304c X \u4ee5\u4e0a\u3067\u3042\u308b\u533a\u9593\u3092\u6570\u3048\u307e\u3057\u3087\u3046\u3002 \u5404\u6210\u5206\u3092 X <= x ? 1 : -1 \u3057\u3066\u304a\u304f\u3068\u3001\u7dcf\u548c\u304c 0 \u4ee5\u4e0a\u306e\u533a\u9593\u306e\u6570\u3092\u6570\u3048\u308c\u3070\u3088\u3044\u3067\u3059\u3002 \u5206\u5272\u7d71\u6cbb\u3067\u3059\u3002\u771f\u3093\u4e2d\u3092\u6c7a\u3081\u3066\u3001\u305d\u3053\u304b\u3089\u4e21\u5074\u3078\u306e\u7d2f\u7a4d\u548c\u3092\u8a08\u7b97\u3067\u3059\u3002 \u5de6\u5074\u3092\u5168\u63a2\u7d22\u3067\u3059\u3002\u5de6\u5074\u304c x \u3060\u3068\u3059\u308b\u3068\u3001\u53f3\u5074\u306f -x \u4ee5\u4e0a\u306e\u3082\u306e\u3092\u6570\u3048\u308c\u3070\u3088\u304f\u3001\u3053\u308c\u306f\u7d2f\u7a4d\u2026","height":"190","blog_url":"https://blog.ngtkana.com/","width":"100%","author_name":"ngtkana","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fblog.ngtkana.com%2Fentry%2F2020%2F01%2F09%2F012814\" title=\"ARC 101 (virtual) \u89e3\u6cd5 - \u30d6\u30ed\u30b0\u540d\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","published":"2020-01-09 01:28:14","title":"ARC 101 (virtual) \u89e3\u6cd5","provider_url":"https://hatena.blog","version":"1.0","type":"rich","blog_title":"\u30d6\u30ed\u30b0\u540d","url":"https://blog.ngtkana.com/entry/2020/01/09/012814"}