基本情况 ABCD秒了。 E一眼二位前缀和,但是板子就是不熟,硬生生拖了半小时。 E. Counting Rectangles Problem - E - Codeforces 真没啥好说的 二位前缀和就是不熟练、不透彻。 挂篇博客复习本栏目推荐文章NSSCTF Round#16 Basic WriteUpHey left 1 Codeforces Round 918 (Div. 4)vue3 获取循环的div的总宽度CodeForces 1312G AutocompletionEducational Codeforces Round 152 (Rated for Div. 2)codeforces 918 div4div滚动加载数据CF Beta Round 93-D.Fibonacci Sums-齐肯多夫分解、DPCodeForces 1329D Dreamoon Likes StringsCodeForces 1237H Balanced ReversalsCodeforces Round 817 Divcodeforces round 817 div codeforces round 911 div codeforces round 864 div codeforces round 887 div codeforces round 863 div codeforces round 913 div codeforces round 915 div codeforces round 917 div codeforces round 912 div codeforces round 888 div