Random Teams

combinatorics, constructive algorithms, greedy, math

Pashmak and Flowers

combinatorics, implementation, sortings

Apple Tree

combinatorics, dfs and similar, dp, math, trees

Forming Triangles

combinatorics, constructive algorithms, math, sortings

AND 0, Sum Big

bitmasks, combinatorics, math

Yet Another Broken Keyboard

combinatorics, dp, implementation

Combinatorics Homework

combinatorics, greedy, math

Counting Orders

combinatorics, math, sortings, two pointers

Erase First or Second Letter

brute force, combinatorics, data structures, dp, strings

Lucky Numbers

combinatorics, math

Binary Cafe

bitmasks, combinatorics, math

Tavas and SaDDas

bitmasks, brute force, combinatorics, implementation

Bestie

brute force, combinatorics, constructive algorithms, implementation, math, number theory

Contest Start

combinatorics, geometry, greedy, math

JOE is on TV!

combinatorics, greedy, math

Pasha and Stick

combinatorics, math

Infinite Replacement

combinatorics, implementation, strings

Ski Resort

combinatorics, math, two pointers

Silent Classroom

combinatorics, greedy

Emordnilap

combinatorics, greedy, math

Luntik and Subsequences

combinatorics, math

Hossam and Combinatorics

combinatorics, math, sortings

Customising the Track

combinatorics, greedy, math

Longest Divisors Interval

brute force, combinatorics, greedy, math, number theory

Far Relative’s Birthday Cake

brute force, combinatorics, constructive algorithms, implementation

CQXYM Count Permutations

combinatorics, math, number theory

A-characteristic

combinatorics, constructive algorithms, math

Marin and Anti-coprime Permutation

combinatorics, math, number theory

Matching

combinatorics, math

Domino on Windowsill

combinatorics, constructive algorithms, math

Dictionary

combinatorics, math

Password

brute force, combinatorics, implementation, math

Sum in Binary Tree

bitmasks, combinatorics, math, trees