Lucky Tickets

divide and conquer, dp, fft

Inversion Expectation

dp, math, probabilities

The Top Scorer

combinatorics, dp, math, probabilities

Vasya and Array

dp

Alice the Fan

dp

Ehab and a component choosing problem

dp, greedy, math, trees

Beautiful Matrix

combinatorics, data structures, dp

The Fair Nut and Rectangles

data structures, dp, geometry

Speed Dial

dp, strings, trees

Summer Practice Report

dp, greedy

Choosing Two Paths

dfs and similar, dp, greedy, trees

Segment Sum

bitmasks, combinatorics, dp, math

Streets and Avenues in Berhattan

dp

Monsters and Potions

brute force, dp, greedy, implementation

Find a Number

dp, graphs, number theory, shortest paths

Random Forest Rank

dp, graph matchings, math, trees

Computer Game

dp, greedy, math, probabilities

Up and Down the Tree

dfs and similar, dp, trees

Three Pieces

dfs and similar, dp, shortest paths

String Journey

data structures, dp, string suffix structures

Shrinking Tree

combinatorics, dp

Split the Tree

binary search, data structures, dp, greedy, trees

Write The Contest

binary search, dp, math

Segments on the Line

binary search, dp

Vasya and Big Integers

binary search, data structures, dp, hashing, strings

Make It One

bitmasks, combinatorics, dp, math, number theory, shortest paths

Vasya and Magic Matrix

dp, math, probabilities

Ray in the tube

data structures, divide and conquer, dp, math

You Are Given a Tree

data structures, dp, trees

Wrap Around

dp, strings

Maximum Matching

bitmasks, brute force, dfs and similar, dp, graphs

Little C Loves 3 III

bitmasks, dp, math

Region Separation

combinatorics, dp, number theory, trees

Vasya and Maximum Matching

dp, trees

Guess the number

dp, interactive

Road Projects

dfs and similar, dp, trees

Bracket Substring

dp, strings

Passports

dp, implementation

Mini Metro

dp

Sonya and Ice Cream

binary search, data structures, dp, greedy, shortest paths, trees

Abbreviation

dp, hashing, strings

Two-Paths

data structures, dp, trees

Cowmpany Cowmpensation

combinatorics, dp, math, trees

Compute Power

binary search, dp, greedy

GCD Counting

divide and conquer, dp, dsu, number theory, trees

Flow Control

dfs and similar, dp, greedy, trees

A Trance of Nightfall

dp, geometry, matrices, probabilities

Elevator

dp, graphs, shortest paths

K Paths

combinatorics, data structures, dp, fft, math

Addition on Segments

bitmasks, data structures, divide and conquer, dp

Cactus to Tree

dp, graphs, trees

Kuro and Topological Parity

dp

Kuro and GCD and XOR and SUM

binary search, bitmasks, brute force, data structures, dp, dsu, greedy, math, number theory, strings, trees

Short Code

data structures, dp, greedy, strings, trees

Bandit Blues

combinatorics, dp, fft, math

Alternating Tree

combinatorics, dfs and similar, divide and conquer, dp, probabilities, trees

Mahmoud and Ehab and yet another xor task

bitmasks, dp, math, matrices

Guard Duty (medium)

binary search, dp, greedy, sortings

Encryption (hard)

data structures, dp

Heaps

dp, trees

Path Counting

combinatorics, dp

Almost Increasing Array

data structures, dp

Fibonacci String Subsequences

combinatorics, dp, matrices

Cutlet

data structures, dp

Erasing Substrings

bitmasks, dp, greedy

World of Tank

dp, greedy

Fafa and Ancient Mathematics

dfs and similar, dp, trees

A Preponderant Reunion

constructive algorithms, dp

Palindrome Partition

dp, string suffix structures, strings

Escape Through Leaf

data structures, dp, geometry

Team Work

combinatorics, dp, math

Tree

binary search, dp, trees

Coins Exhibition

data structures, dp, math

Minimal Subset Difference

dp

Wardrobe

dp, greedy

Divisibility

constructive algorithms, dp, greedy, number theory

Birds

dp

Tanks

dp, greedy, implementation

Stranger Trees

dp, math, matrices, trees

Pollywog

combinatorics, dp, matrices

Ember and Storm's Tree Game

combinatorics, dp, games, trees

Sum the Fibonacci

bitmasks, divide and conquer, dp, fft, math

Strongly Connected Tournament

dp, graphs, math, probabilities

Logical Expression

bitmasks, dp, shortest paths

New Year and Original Order

dp, math

New Year and Entity Enumeration

bitmasks, combinatorics, dp, math

New Year and Arbitrary Arrangement

dp, math, probabilities

Reverses

dp, string suffix structures, strings

Party

bitmasks, brute force, dp, graphs

Clear The Matrix

bitmasks, dp

Sloth

dfs and similar, dp, graph matchings, trees

Mod Mod Mod

binary search, dp, math

Connecting Vertices

dp, graphs

Maximum Element

combinatorics, dp, math

Packmen Strike Back

binary search, dp, math

Numbers on the blackboard

combinatorics, dp

Delivery Club

binary search, data structures, dp

Awards For Contestants

brute force, data structures, dp

Yet Another Minimization Problem

divide and conquer, dp

Policeman and a Tree

dp, graphs, trees