Plane of Tanks: Duel

brute force, dp, math, probabilities

Bingo!

combinatorics, math, probabilities

Median Queries

constructive algorithms, interactive, probabilities

Roads in E City

interactive, math, probabilities, trees

Frequency Mismatch (Hard Version)

binary search, data structures, dfs and similar, hashing, probabilities, trees

Clacking Balls

combinatorics, math, probabilities

Ksusha and Square

geometry, math, probabilities, two pointers

A Trance of Nightfall

dp, geometry, matrices, probabilities

Combining Slimes

dp, math, matrices, probabilities

Counting Skyscrapers

dp, math, probabilities

Old Mobile

combinatorics, dp, probabilities

Marek and Matching (hard version)

brute force, probabilities

Marek and Matching (easy version)

brute force, probabilities

School Clubs

dp, fft, math, number theory, probabilities

Alice and the Cactus

dfs and similar, graphs, math, probabilities

Darts

geometry, probabilities

Nezzar and Chocolate Bars

combinatorics, fft, math, probabilities

Don't Exceed

math, probabilities

Colored Jenga

dfs and similar, dp, probabilities

Marmots (hard)

math, probabilities

Help King

implementation, probabilities, trees

Fugitive Frenzy

math, probabilities

Centroid Guess

interactive, probabilities, trees

Tokitsukaze and Powers

number theory, probabilities

Grove

brute force, dfs and similar, dp, geometry, probabilities

Astronomy

geometry, probabilities

Nastya and Bees

graphs, interactive, probabilities

Laser Beams

*special problem, geometry, probabilities

Game of Chance

math, probabilities