Negative Time Summation

constructive algorithms

Railway Construction

brute force, constructive algorithms, data structures, graphs, shortest paths

Intergalactic Sliding Puzzle

combinatorics, constructive algorithms, math

Beautiful Fibonacci Problem

constructive algorithms, number theory

Cactus Revenge

constructive algorithms

Rin and The Unknown Flower

constructive algorithms, greedy, interactive, math

Xor on Figures

constructive algorithms, fft, math

OH NO1 (-2-3-4)

constructive algorithms, graphs, math

Become Big For Me

combinatorics, constructive algorithms, greedy, math, number theory

Euler tour

constructive algorithms, trees

Tree LGM

constructive algorithms, divide and conquer, games, trees

Omkar and Mosaic

combinatorics, constructive algorithms, math

Bugaboo

bitmasks, constructive algorithms, dp, number theory

Lost Nodes

constructive algorithms, dp, graphs, interactive, sortings, trees

Balance the Cards

constructive algorithms, data structures, divide and conquer, geometry, graphs, implementation

Maximum Permutation

constructive algorithms

Anti-Proxy Attendance

constructive algorithms, dp, interactive, ternary search

Copium Permutation

constructive algorithms, data structures, greedy

Impressionism

constructive algorithms, graphs, implementation, math

Permutation Weight (Hard Version)

constructive algorithms, greedy

Mio and Lucky Array

constructive algorithms, fft, math, strings

Neighbour Ordering

constructive algorithms, graphs

Koxia, Mahiru and Winter Festival

constructive algorithms

Slime and Hats

constructive algorithms, dp, greedy

Four Stones

constructive algorithms

Long Recovery

constructive algorithms, dfs and similar

Min-Sum-Max

constructive algorithms, dp, greedy

BinaryStringForces

constructive algorithms, data structures, dp

Three Minimums

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

Redundant Routes

constructive algorithms, dp, trees

Parallel Swaps Sort

constructive algorithms, data structures