griefworker https://blog.hatena.ne.jp/griefworker/ present https://tnakamura.hatenablog.com/ .NET C# 競技プログラミング atcoder.jp 3重ループだと時間切れになるので、2重ループで。 var input = Console.ReadLine()!.Split(' '); var N = int.Parse(input[0]); var K = int.Parse(input[1]); var answer = 0; for (var r = 1; r <= N; r++) { for (var b = 1; b <= N; b++) { var w = K - (r + b); if (w > 0 && w <= N) { answer++; } } } Console.WriteLine(answer… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Ftnakamura.hatenablog.com%2Fentry%2F2023%2F10%2F11%2Fa05" title="A05 - Three Cards - present" 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 2023-10-11 19:01:20 rich https://tnakamura.hatenablog.com/entry/2023/10/11/a05 1.0 100%