Wet Shark and Flowers

Rat Kwesh and Cheese

Wet Shark and Blocks

动态规划 DP · 矩阵乘法 · 构造

Infinite Sequence

模拟 · 数学

The Time

Not Equal on a Segment

Optimal Number Permutation

Ants in Leaves

动态规划 DP · 贪心 · 排序 · 树形 DP · 树论

The Sum of the k-th Powers

Stirling 数 · 拉格朗日插值法

Graph and String

Array GCD

Electric Charges

Birthday

Transforming Sequence

快速傅里叶变换 FFT

Save Luke

Making a String

Guest From the Past

War of the Corporations

K-special Tables

Finals in arithmetic

Frog Fights

Robot Sequence

Cards

Block Towers

枚举

Jerry's Protest

Simple Skewness

Group Projects

动态规划 DP · 枚举

Raffles

XOR Equation

Factory Repairs

线段树 · 树状数组

Package Delivery

贪心

Preorder Test

二分 · 深度优先搜索 DFS

Orchestra

链表

Island Puzzle

Tennis Tournament

New Skateboard

Bear and String Distance

Magic Numbers

动态规划 DP · 数位 DP

Zbazi in Zeydabad

Bear and Fair Set

网络流

Far Relative’s Birthday Cake

枚举 · 深度优先搜索 DFS

Far Relative’s Problem

Famil Door and Brackets

Babaei and Birthday Cake

树状数组 · 排序

Famil Door and Roads

Again Twenty Five!

Moore's Law

Lucky Numbers

Hexagons!

A rectangle