Sonya and Robots

Sonya and Matrix

Sonya and Ice Cream

Sonya and Bitwise OR

线段树

Tanya and Stairways

模拟 · 概率论

Delete from the Left

字符串

Summarize to the Power of Two

Polycarp and Div 3

字符串 · 贪心 · 前缀和

Median on Segments (General Case Edition)

Median on Segments (Permutations Edition)

Berland and the Shortest Paths

最短路

Adjacent Replacements

Polycarp's Practice

Three Parts of the Array

递归 · 深度优先搜索 DFS · 前缀和

Two Strings Swaps

字符串

Military Problem

深度优先搜索 DFS · 图论建模 · 向量

Xor-Paths

搜索 · 折半搜索 meet in the middle

Reorder the Array

Pave the Parallelepiped

Guess two numbers

Ants

Mini Metro

Romaji

字符串

Turn the Rectangles

Reorder the Array

排序

Pave the Parallelepiped

Guess two numbers

Game Shopping

模拟

Minimum Ternary String

字符串 · 贪心 · 概率论

Annoying Present

Relatively Prime Graph

枚举

Intercity Travelling

Dominant Indices

动态规划 DP · 树上启发式合并 · 枚举 · 树链剖分 · 线段树合并

Allowed Letters

Fly

Rocket

Border

最大公约数 gcd · 进制 · 构造

Mars rover

Store

Tree

Stages

Planning The Expedition

模拟 · 枚举 · 概率论

Photo of The Sky

Chemical table

并查集 · 概率论 · 构造

Hills

AB-Strings

字符串 · 前缀和

Cycle sort

Passports

Piles With Stones

And