[ABC276D] Divide by 2 or 3

[ABC276E] Round Trip

[ABC276F] Double Chance

[ABC276G] Count Sequences

[ABC276Ex] Construct a Matrix

[ABC277A] ^{-1}

[ABC277B] Playing Cards Validation

[ABC277C] Ladder Takahashi

[ABC277D] Takahashi's Solitaire

[ABC277E] Crystal Switches

[ABC277F] Sorting a Matrix

[ABC277G] Random Walk to Millionaire

动态规划 DP · 期望

[ABC277Ex] Constrained Sums

2-SAT

[ABC278A] Shift

[ABC278B] Misjudge the Time

[ABC278C] FF

[ABC278D] All Assign Point Add

[ABC278E] Grid Filling

[ABC278F] Shiritori

[ABC278G] Generalized Subtraction Game

博弈论 · SG 函数

[ABC278Ex] make 1

[ABC279A] wwwvvvvvv

[ABC279B] LOOKUP

[ABC279C] RANDOM

[ABC279D] Freefall

[ABC279E] Cheating Amidakuji

[ABC279F] BOX

[ABC279G] At Most 2 Colors

线性 DP

[ABC279Ex] Sum of Prod of Min

[ABC280A] Pawn on a Grid

[ABC280B] Inverse Prefix Sum

[ABC280C] Extra Character

[ABC280D] Factorial and Multiple

[ABC280E] Critical Hit

[ABC280F] Pay or Receive

图论 · 图论建模 · 最短路

[ABC280G] Do Use Hexagon Grid 2

容斥原理

[ABC280Ex] Substring Sort

[ABC281A] Count Down

[ABC281B] Sandwich Number

[ABC281C] Circular Playlist

[ABC281D] Max Multiple

动态规划 DP · 数论

[ABC281E] Least Elements

[ABC281F] Xor Minimization

贪心 · 字典树 Trie · 位运算

[ABC281G] Farthest City

动态规划 DP · 组合数学 · 排列组合

[ABC281Ex] Alchemy

[ABC282A] Generalized ABC

模拟

[ABC282B] Let's Get a Perfect Score

模拟

[ABC282C] String Delimiter

模拟 · 字符串

[ABC282D] Make Bipartite 2

图遍历 · 二分图

[ABC282E] Choose Two and Eat One

生成树