Removal of a Sequence (Easy Version)

数学 · 二分

Points Selection

动态规划 DP · 贪心

Subsequence Problem

Maximum Neighborhood

模拟

Addition on a Segment

数学 · 排序 · Ad-hoc

Quotient and Remainder

贪心 · 二分

Almost Roman

贪心

Binary Strings and Blocks

动态规划 DP · 树状数组 · 前缀和 · 容斥原理

Build XOR on a Segment

动态规划 DP · 线性基

Shizuku Hoshikawa and Farm Legs

模拟 · 数学

Yuu Koito and Minimum Absolute Sum

贪心

Renako Amaori and XOR Game (hard version)

贪心

Renako Amaori and XOR Game (easy version)

贪心

Rae Taylor and Trees (easy version)

Anisphia Wynn Palettia and Good Permutations

数学 · 构造

Rae Taylor and Trees (hard version)

Sakura Adachi and Optimal Sequences

Shiori Miyagi and Maximum Array Score

动态规划 DP

ASCII Art Contest

Buses

贪心 · 二分 · 排序

Circles Are Far from Each Other

贪心 · 二分

Divisor Card Game

动态规划 DP · 数学

Number Maze

Cluster Computing System

Gene Editor

Shuffling Cards with Problem Solver 68!

哈希 hashing

Birthday

凸包

Sliding Tiles

Kindergarten Homework

Maximum Color Segment

动态规划 DP · 背包 DP

Maximum Distance To Port

最短路

New Kingdom

Sleeping Through Classes

模拟

Niko's Tactical Cards

贪心

Kanade's Perfect Multiples

Taiga's Carry Chains

动态规划 DP · 贪心

Shiro's Mirror Duel

Isla's Memory Thresholds

Needle in a Haystack

字符串 · 贪心

Wishing Cards

动态规划 DP

Beautiful Patterns (Hard Version)

数学 · 前缀和 · 期望

Beautiful Patterns (Easy Version)

数学 · 期望

Secret Message

贪心 · 树形数据结构 · 树链剖分

Game of Scientists (Version 2)

Game of Scientists (Version 1)

Mosaic Tree

动态规划 DP · 数学 · 组合数学

Little Fairy's Painting

Ad-hoc

XOR Array

构造

Operations with Inversions

贪心

Optimal Shifts

贪心