AquaMoon and Time Stop (hard version)

data structures, dp

Cyclic Hamming (Easy Version)

brute force, divide and conquer, dp, fft, math, number theory

Anti-median (Hard Version)

combinatorics, dp, math

Short Permutation Problem

combinatorics, dp, fft, math

AquaMoon and Time Stop (easy version)

data structures, dp

Min-Sum-Max

constructive algorithms, dp, greedy

Jellyfish and Inscryption

dp

Goldberg Machine 3

dp, trees

BinaryStringForces

constructive algorithms, data structures, dp

A Battle Against a Dragon

*special problem, data structures, dp

Redundant Routes

constructive algorithms, dp, trees

Three Minimums

combinatorics, constructive algorithms, divide and conquer, dp, fft, math

Spiderweb Trees

dp, geometry, trees

Doremy's Average Tree

data structures, dp, greedy, trees

M-numbers

*special problem, dp, math

Uniform Chemistry

dp, math

Fly Around the World

dp, geometry

Crossing the Railways

data structures, dp

Farmer John's Favorite Intern

data structures, dp, flows, trees

Big Persimmon

*special problem, dp, games

Again Counting Arrays (Hard Version)

combinatorics, dp, math

Pac-Man 2.0

*special problem, dp

Zero-XOR Array

*special problem, dp

Chess Rush

*special problem, combinatorics, dp, implementation, math

Road Repair in Treeland

*special problem, binary search, dp, trees

Inverse Problem

*special problem, combinatorics, dp

Paint the String

*special problem, dp, strings

Good Subsets

*special problem, dp

Lisa's Sequences

dp

Draw Polygon Lines

*special problem, constructive algorithms, dp, geometry, interactive