摘要:
CF rating+200 ST表+前缀和+悬绳法https://codeforces.com/problemset/problem/1691/D 前缀和+数学推导https://codeforces.com/problemset/problem/1630/B ABC AtCoder Beginne 阅读全文
摘要:
CF rating+200 二分套二分 https://codeforces.com/contest/1941/submission/252667256 简单数学 https://codeforces.com/problemset/problem/1796/C 组合数学 https://codefo 阅读全文