https://admin.teferi.net/ 2026-06-07T18:35:07+00:00 https://admin.teferi.net/ https://admin.teferi.net/_media/wiki/dokuwiki.svg text/html 2026-05-20T03:08:46+00:00 teferi (teferi@undisclosed.example.com) https://admin.teferi.net/ps/codeforces?rev=1779246526&do=diff Codeforces 난이도 체계 비교 * 솔브드 레이팅이 매겨진 문제들만 샘플링 * Hello 2020 (<https://codeforces.com/contest/1284>) New Year and Naming *800 New Year and Ascent Sequence *1400 New Year and Permutation *1600 New Year and Conference *2100 text/html 2026-05-20T02:30:50+00:00 teferi (teferi@undisclosed.example.com) https://admin.teferi.net/ps/problems/start?rev=1779244250&do=diff 문제 문제를 풀 수 있는 사이트 * 백준 온라인 저지 (BOJ) * 프로그래머스 * LeetCode * 정올 (JUNGOL) * Advent Of Code * CSES * Library Checker (Yosupo) * Codeforces * atcoder * CP 사이트들의 목록은 <https://clist.by/resources/> 에 잘 정리되어있다. * Contest를 개최하는 사이트를 기준으로 한 것이기 때문에 그냥 문제만 풀 수 있는 사이트들은 빠져있다. text/html 2026-05-19T02:36:11+00:00 teferi (teferi@undisclosed.example.com) https://admin.teferi.net/ps/problems/cses/1662?rev=1779158171&do=diff Subarray Divisibility 풀이 * 누적합 (Prefix sums) 을 이용하는 기본 유형의 문제 * 누적합을 n으로 나눈 나머지들로 누적합 배열을 만든 다음, 같은 값을 갖는 인덱스 쌍의 개수를 세어주면 된다. * 기본 유형의 문제이지만 CSES 문제의 특성으로 text/html 2026-05-17T15:25:32+00:00 teferi (teferi@undisclosed.example.com) https://admin.teferi.net/ps/problems/codeforces/1665b?rev=1779031532&do=diff Array Cloning Technique * 처음 주어진 배열의 원소들 중에서, 가장 빈도수가 높은 원소로 다른 모든 원소들을 바꿔주는게 최선이다. * 가장 빈도수가 높은 원소가 x, 그 빈도수가 k라고 하면, 필요한 연산의 횟수는 시뮬레이션으로 구할수 있다. 수열을 클론하고 text/html 2026-04-07T02:07:17+00:00 teferi (teferi@undisclosed.example.com) https://admin.teferi.net/?image=ps%3Asuapc2022w.pdf&ns=ps&rev=1775527637&tab_details=history&media_do=diff&do=media <img src="https://admin.teferi.net/lib/images/fileicons/svg/pdf.svg" alt="suapc2022w.pdf" loading="lazy" width="500" height="500" /> text/html 2026-04-03T01:36:53+00:00 teferi (teferi@undisclosed.example.com) 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