https://articles.lightoj.com 2026-05-01T16:33:11.337Z always 1.0 https://articles.lightoj.com/longest-increasing-subsequence 2022-12-09T00:55:16.453Z daily 0.8 https://articles.lightoj.com/prime-factorization 2022-11-05T19:57:52.320Z daily 0.8 https://articles.lightoj.com/archive 2026-05-01T16:33:11.337Z daily 0.5 https://articles.lightoj.com/recommendations 2026-05-01T16:33:11.337Z weekly 0.4