Complete the Projects (easy version)

BowWow and the Timetable

Mislove Has Lost an Array

Anna, Svyatoslav and Maps

Kirk and a Binary String (hard version)

Kirk and a Binary String (easy version)

Natasha, Sasha and the Prefix Sums

数学 · 组合数学 · 排列组合 · 容斥原理

Almost Equal

Shortest Cycle

Palindromic Paths

Almost All

Expected Value Again

Beauty of a Permutation

Choose Two Numbers

Make Product Equal One

There Are Two Types Of Burgers

Square Filling

Gas Pipeline

Number Of Permutations

XOR Guessing

Remainder Problem

根号分治

Indie Album

XORinacci

Uniqueness

Magic Grid

Restore Permutation

Let Them Slide

Bits And Pieces

Polygons

数学 · 数论

Red Blue Tree

Paint the Numbers

Koala and Lights

Paint the Digits

Cow and Snacks

Rotate Columns (hard version)

Rotate Columns (easy version)

Koala and Notebook

Into Blocks (hard version)

贪心 · 线段树

Into Blocks (easy version)

Moving Walkways

Anadi and Domino

Marcin and Training Camp

Kamil and Making a Stream

倍增 · 数论

Konrad and Company Evaluation

图论 · 枚举 · 图论建模

Wojtek and Card Tricks

Marek and Matching (hard version)

DP 套 DP

Marek and Matching (easy version)

Mateusz and Escape Room

动态规划 DP · 三分 · 动态规划优化 · 斜率维护技巧 slope trick

Three Problems

Traveling Around the Golden Ring of Berland