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Codeforces Round #495 (Div. 2) - D. Sonya and Matrix Codeforces Round #495 (Div. 2) - D. Sonya and Matrix Description Input Output Examples Input Ouput Input Output Input Output 题意 题解 代码 ...

Codeforces Round #495 (Div. 2) - E. Sonya and Ice Cream Codeforces Round #495 (Div. 2) - E. Sonya and Ice Cream Description Input Output Examples Input Ouput Input Output 题意 题解 代码 Descri...

Educational Codeforces Round 49 (Rated for Div. 2)-E. Inverse Coloring-基础dp Educational Codeforces Round 49 (Rated for Div. 2)-E. Inverse Coloring-基础dp Description Input Output Examples Input Outpu...

#Codeforces Round #551 (Div. 2)-C. Serval and Parenthesis Sequence-括号匹配问题 【Description】 Serval soon said goodbye to Japari kindergarten, and began his life in Japari Primary School. In his favorite ...

Codeforces Round #551 (Div. 2)-D. Serval and Rooted Tree-树上dp-逆思维 【Description】 Now Serval is a junior high school student in Japari Middle School, and he is still thrilled on math as before. As a t...

Codeforces Global Round 3-F. Foo Fighters-思维 【Description】 You are given n objects. Each object has two integer properties: vali — its price — and maski. It is guaranteed that the sum of all prices i...

Educational Codeforces Round 66 (Rated for Div. 2)-F. The Number of Subpermutations-哈希方法求子排列个数 【Description】 You have an array a1,a2,…,an. Let's call some subarray al,al+1,…,ar of this array a subper...

Codeforces Round #578 (Div. 2)-D. White Lines-差分前缀和 【Problem Description】 给你一个字符矩阵，其中B表示黑色，W表示白色。你可以任意选择一个格子（i，j),将（i，j)~(i+k-1,j+k-1)的矩形 区域内的格子全部刷为白色。然后问最多可以有多少个行列满足一整行是白色或者一整列是白色。 【Solution】 思路是，对...