ZS and The Birthday Paradox

Memory and Crow

Memory and Trident

概率论

Memory and De-Evolution

贪心 · 枚举

Memory and Scores

动态规划 DP · 动态规划优化 · 前缀和

Memory and Casinos

Sonya and Queries

Searching Rectangles

Sonya and Problem Without a Legend

动态规划 DP · 斜率维护技巧 slope trick

Animals and Puzzle

二分 · ST 表 · 整体二分

Sonya Partymaker

Meeting of Old Friends

Filya and Homework

Plus and Square Root

Complete The Graph

枚举 · 最短路

Digit Tree

点分治 · 树上启发式合并 · 逆元

Create a Maze

构造 · Ad-hoc

Complete the Permutations

Crazy Computer

Complete the Word

Festival Organization

组合数学 · 二项式定理

R3D3’s Summer Adventure

Potions Homework

Dexterina’s Lab

Paint it really, really dark gray

Heroes of Making Magic III

Underfail

Pokermon League challenge

Cowboy Beblop at his computer

Efim and Strange Grade

贪心

Sasha and Array

线段树 · Fibonacci 数列 · 矩阵乘法

Andrew and Chemistry

Matvey's Birthday

枚举 · 最短路 · 进制

Vitya in the Countryside

Anatoly and Cockroaches

Closing ceremony

排序 · 队列

Cactusophobia

Homework

Slalom

Cipher

Array Covering

One-dimensional Japanese Crossword

模拟 · 字符串

Passwords

Journey

动态规划 DP · 拓扑排序

Maxim and Array

Road to Home

Broken Clock

Verse Pattern

字符串

Destroying Array

线段树 · 并查集

Generating Sets