Alarm Clock

贪心

Squares and not squares

Restoring the Expression

哈希 hashing

Splitting in Teams

模拟 · 概率论 · 栈

Months and Years

Dividing the numbers

Shovel Sale

Segments Removal

线段树 · 优先队列 · 队列

Letters Removing

Find Extra One

概率论

Position in Fraction

模拟 · 字符串 · 高精度

Remove Extra One

数学 · 树状数组

Unusual Sequences

数论 · 莫比乌斯反演 · 组合数学 · 容斥原理

Maximum Questions

Hashing Trees

GCD of Polynomials

Bipartite Segments

Weighting a Tree

生成树 · 最近公共祖先 LCA · 构造

Cyclic Cipher

Visiting a Friend

Coloring a Tree

Hungry Student Problem

模拟 · 枚举

The Modcrab

Boxes Packing

贪心 · 排序

Almost Difference

Swapping Characters

Clear The Matrix

Yet Another Maxflow Problem

线段树 · 最小割

Shockers

Seating of Students

Party

Power Tower

递归 · 数论 · 欧拉降幂 · 欧拉函数

Reverses

Masha and Bears

Tic-Tac-Toe

New Year and Counting Cards

New Year and Buggy Bot

New Year and Curling

New Year and Arbitrary Arrangement

动态规划 DP · 期望 · 逆元

New Year and Entity Enumeration

New Year and Rainbow Roads

贪心

New Year and Original Order

数学 · 数位 DP · 组合数学

New Year and Boolean Bridges

Generate Login

字符串 · 搜索 · 贪心 · 枚举

Segments

Python Indentation

Colorful Points

Coprocessor

排序 · 拓扑排序 · 队列

AND-permutations

The Way to Home

图论 · 最短路