inamori https://blog.hatena.ne.jp/inamori/ inamori’s diary https://inamori.hateblo.jp/ https://atcoder.jp/contests/abc447/tasks/abc447_c尺取り法的にカウントしていけばよいです。 F <- function(S, T) { k <- 1 l <- 1 L1 <- nchar(S) L2 <- nchar(T) counter <- 0 while(k <= L1 && l <= L2) { c1 <- substr(S, k, k) c2 <- substr(T, l, l) if(c1 == c2) { k <- k + 1 l <- l + 1 } else if(c1 == "A") { k <- k + 1 counter … 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Finamori.hateblo.jp%2Fentry%2F2026%2F03%2F06%2F185228" title="AtCoder Beginner Contest 447 C - inamori’s diary" 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 2026-03-06 18:52:28 rich https://inamori.hateblo.jp/entry/2026/03/06/185228 1.0 100%