[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

[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

[ABC127B] Algae

[ABC127C] Prison

[ABC127D] Integer Cards

[ABC127E] Cell Distance

[ABC127F] Absolute Minima

[ABC128A] Apple Pie

[ABC128B] Guidebook

[ABC128C] Switches

[ABC128D] equeue

[ABC128E] Roadwork

[ABC128F] Frog Jump

[ABC129A] Airplane

[ABC129B] Balance

[ABC129C] Typical Stairs

[ABC129D] Lamp

[ABC129E] Sum Equals Xor

[ABC129F] Takahashi's Basics in Education and Learning

[ABC130A] Rounding

[ABC130B] Bounding

[ABC130C] Rectangle Cutting

[ABC130D] Enough Array

[ABC130E] Common Subsequence

[ABC130F] Minimum Bounding Box

三分

[ABC131A] Security