[ABC115B] Christmas Eve Eve

[ABC115C] Christmas Eve

[ABC115D] Christmas

[ABC116A] Right Triangle

[ABC116B] Collatz Problem

[ABC116C] Grand Garden

[ABC116D] Various Sushi

贪心 · 排序

[ABC117A] Entrance Examination

[ABC117B] Polygon

[ABC117C] Streamline

[ABC117D] XXOR

[ABC118A] B +/- A

[ABC118B] Foods Loved by Everyone

[ABC118C] Monsters Battle Royale

[ABC118D] Match Matching

动态规划 DP

[ABC119A] Still TBD

[ABC119B] Digital Gifts

[ABC119C] Synthetic Kadomatsu

[ABC119D] Lazy Faith

[ABC120A] Favorite Sound

[ABC120B] K-th Common Divisor

[ABC120C] Unification

[ABC120D] Decayed Bridges

图论 · 并查集

[ABC121A] White Cells

[ABC121B] Can you solve this?

[ABC121C] Energy Drink Collector

[ABC121D] XOR World

[ABC122A] Double Helix

[ABC122B] ATCoder

[ABC122C] GeT AC

[ABC122D] We Like AGC

[ABC123A] Five Antennas

[ABC123B] Five Dishes

[ABC123C] Five Transportations

[ABC123D] Cake 123

[ABC124A] Buttons

[ABC124B] Great Ocean View

[ABC124C] Coloring Colorfully

[ABC124D] Handstand

[ABC125A] Biscuit Generator

[ABC125B] Resale

[ABC125C] GCD on Blackboard

[ABC125D] Flipping Signs

[ABC126A] Changing a Character

[ABC126B] YYMM or MMYY

[ABC126C] Dice and Coin

概率论

[ABC126D] Even Relation

[ABC126E] 1 or 2

图论 · 并查集 · 深度优先搜索 DFS · 连通块

[ABC126F] XOR Matching

[ABC127A] Ferris Wheel