AquaMoon and Potatoes

[USACO3.1] 最短网络 Agri-Net

图论 · 贪心 · USACO · 并查集 · 生成树

AquaMoon and Two Arrays

AquaMoon and Stolen String

[USACO05MAR] Out of Hay S

图论 · 贪心 · 2005 · USACO · 并查集 · 生成树 · 连通块

Shortest Path with Obstacle

Alphabetical Strings

Pair Programming

Co-growing Sequence

Air Conditioners

Array Stabilization (GCD version)

数学 · 二分 · ST 表

How Many Paths?

深度优先搜索 DFS · 拓扑排序 · 强连通分量

[NOIP 1997 普及组] 棋盘问题

1997 · NOIP 普及组 · 枚举

Web of Lies

Integers Have Friends

数学 · 线段树 · ST 表 · 双指针 two-pointer

The Three Little Pigs

Gregor and the Odd Cows (Hard)

Gregor and the Odd Cows (Easy)

Gregor and the Two Painters

[NOIP 1997 提高组] 棋盘问题

1997 · NOIP 提高组 · Special Judge

Gregor and Cryptography

Gregor and the Pawn Game

[USACO08OCT] Watering Hole G

图论 · 贪心 · 2008 · USACO · 生成树

Find The Array

Maximum Cost Deletion

Manhattan Subarrays

Excellent Arrays

Stringforces

Jumping Around

亲戚

并查集

Polycarp and Coins

Wonderful Coloring - 2

Wonderful Coloring - 1

Interesting Story

Domino (hard version)

Domino (easy version)

Fixed Points

Equidistant Vertices

[APIO2012] 派遣

动态规划 DP · 2012 · 线段树 · 平衡树 · 树上启发式合并 · APIO · 可并堆 · 栈 · 线段树合并

Subsequence Permutation

Running for Gold

Maximize the Intersections

Array Differentiation

Colors and Intervals

Telepanting

A Serious Referee

搜索 · 位运算

Guess the Perimeter

Organizing a Music Festival

数字反转（升级版）

模拟 · 字符串 · 洛谷原创

Digits Sum