[ABC131B] Bite Eating

[ABC131C] Anti-Division

数学 · 最大公约数 gcd

[ABC131D] Megalomania

[ABC131E] Friendships

[ABC131F] Must Be Rectangular!

[ABC132A] Fifty-Fifty

[ABC132B] Ordinary Number

[ABC132C] Divide the Problems

[ABC132D] Blue and Red Balls

[ABC132E] Hopscotch Addict

[ABC132F] Small Products

[ABC133A] T or T

[ABC133B] Good Distance

[ABC133C] Remainder Minimization 2019

[ABC133D] Rain Flows into Dams

[ABC133E] Virus Tree 2

[ABC133F] Colorful Tree

线段树 · 树状数组 · 树链剖分 · 可持久化线段树

[ABC134A] Dodecagon

[ABC134B] Golden Apple

[ABC134C] Exception Handling

[ABC134D] Preparing Boxes

枚举

[ABC134E] Sequence Decomposing

[ABC134F] Permutation Oddness

动态规划 DP

[ABC135A] Harmony

[ABC135B] 0 or 1 Swap

[ABC135C] City Savers

[ABC135D] Digits Parade

[ABC135E] Golf

[ABC135F] Strings of Eternity

[ABC136A] Transfer

[ABC136B] Uneven Numbers

[ABC136C] Build Stairs

[ABC136D] Gathering Children

[ABC136E] Max GCD

[ABC136F] Enclosed Points

[ABC137A] +-x

[ABC137B] One Clue

[ABC137C] Green Bin

[ABC137D] Summer Vacation

贪心 · 并查集 · 堆 · 排序

[ABC137E] Coins Respawn

最短路 · 负权环

[ABC137F] Polynomial Construction

[ABC138A] Red or Not

[ABC138B] Resistors in Parallel

[ABC138C] Alchemist

堆 · 排序

[ABC138D] Ki

[ABC138E] Strings of Impurity

[ABC138F] Coincidence

数位 DP

[ABC139A] Tenki

[ABC139B] Power Socket

[ABC139C] Lower