[ARC131E] Christmas Wreath

[ARC131F] ARC Stamp

[ARC132A] Permutation Grid

[ARC132B] Shift and Reverse

[ARC132C] Almost Sorted

动态规划 DP · 状态合并

[ARC132D] Between Two Binary Strings

[ARC132E] Paw

[ARC132F] Takahashi The Strongest

容斥原理 · 快速沃尔什变换 FWT

[ARC133A] Erase by Value

[ARC133B] Dividing Subsequence

[ARC133C] Row Column Sums

[ARC133D] Range XOR

[ARC133E] Cyclic Medians

[ARC133F] Random Transition

组合数学 · 生成函数

[ARC134A] Bridge and Sheets

[ARC134B] Reserve or Reverse

[ARC134C] The Majority

[ARC134D] Concatenate Subsequences

[ARC134E] Modulo Nim

[ARC134F] Flipping Coins

[ARC135A] Floor, Ceil - Decomposition

[ARC135B] Sum of Three Terms

[ARC135C] XOR to All

[ARC135D] Add to Square

[ARC135E] Sequence of Multiples

[ARC135F] Delete 1, 4, 7, ...

[ARC136A] A ↔ BB

[ARC136B] Triple Shift

[ARC136C] Circular Addition

[ARC136D] Without Carry

动态规划 DP · 前缀和

[ARC136E] Non-coprime DAG

[ARC136F] Flip Cells

[ARC137A] Coprime Pair

[ARC137B] Count 1's

[ARC137C] Distinct Numbers

贪心 · 博弈论

[ARC137D] Prefix XORs

排列组合 · 前缀和 · 位运算 · Lucas 定理

[ARC137E] Bakery

[ARC137F] Overlaps

[ARC138A] Larger Score

[ARC138B] 01 Generation

[ARC138C] Rotate and Play Game

[ARC138D] Differ by K bits

[ARC138E] Decreasing Subsequence

[ARC138F] KD Tree

[ARC139A] Trailing Zeros

[ARC139B] Make N

[ARC139C] One Three Nine

[ARC139D] Priority Queue 2

[ARC139E] Wazir

[ARC139F] Many Xor Optimization Problems