Deranged Deletions

Minimise Sum

贪心

Subset Multiplication

数学 · 贪心 · 最大公约数 gcd

Make a Palindrome

贪心

Make it Zero

贪心 · 构造 · Ad-hoc

Appending Permutations (Hard Version)

动态规划 DP · 组合数学

Appending Permutations (Easy Version)

动态规划 DP · 组合数学

Maximise Sum

Longest Good Subsequence

Lexicographic Partition

Difficult Contest

排序 · 构造

Left and Down

数学

Count Good Numbers

数学 · 容斥原理

Segments Covering

动态规划 DP · 数学 · 期望

Sets of Complementary Sums

动态规划 DP · 构造

Timofey and Docker

动态规划 DP · 贪心 · 凸完全单调性（wqs 二分）

Only One Digit

No Casino in the Mountains

贪心

I Will Definitely Make It

贪心

This Is the Last Time

贪心

G-C-D, Unlucky!

数学

1-1-1, Free Tree!

Big Wins! (hard version)

线段树 · 二分 · 并查集 · 可持久化线段树 · 单调栈

Big Wins! (easy version)

Mix Mex Max

数学 · 贪心 · 构造

Hamiiid, Haaamid... Hamid?

贪心 · 博弈论

Trip Shopping

贪心 · 排序

Root was Built by Love, Broken by Destiny

数学 · 树论 · 组合数学

Ancient Tree

贪心 · 树上启发式合并 · 虚树 · 线段树合并 · 启发式合并

Hamed and AghaBalaSar

数学 · 组合数学 · 排列组合 · 容斥原理

Inter Active (Hard Version)

Inter Active (Easy Version)

23 Rises Again

图论 · 贪心 · 图论建模 · 随机化 · Ad-hoc

Recycling Center

Deque Process

Leftmost Below

Sum of LDS

动态规划 DP

Submedians (Hard Version)

Submedians (Easy Version)

贪心 · 二分

Strict Triangle

Double Perspective

贪心 · 排序

Stay or Mirror

贪心

Interactive RBS (Hard Version)

Interactive RBS (Medium Version)

Interactive RBS (Easy Version)

Permutation Blackhole

区间 DP

Induced Subgraph Queries

莫队 · 分块

Top-K Tracker (Hard Version)

随机化 · 构造 · Ad-hoc

Top-K Tracker (Easy Version)

构造 · Ad-hoc

Submission is All You Need

数学 · 贪心