Bricks

flows, graph matchings, graphs

k-Maximum Subsequence Sum

data structures, flows, graphs, implementation

Almost Permutation

flows

Goods transportation

dp, flows, greedy

Binary Tree on Plane

flows, trees

Kirill and Company

bitmasks, brute force, dfs and similar, dp, flows, graphs, shortest paths

Four Points

brute force, constructive algorithms, flows, geometry, greedy, implementation, math, ternary search

Grouped Carriages

binary search, data structures, dp, flows, greedy

Build String

flows, graphs

Flawed Flow

constructive algorithms, flows, graphs, greedy

Ann and Books

data structures, flows, hashing

Maximize Mex

flows, graph matchings, graphs

Yet Another Array Counting Problem

binary search, data structures, divide and conquer, dp, flows, math, trees

Valuable Paper

binary search, flows, graph matchings, graphs

T-shirts Distribution

constructive algorithms, flows, greedy

One-Way Reform

constructive algorithms, dfs and similar, flows, graphs, greedy

Petya and Graph

flows, graphs

Olympiad in Programming and Sports

dp, flows, graphs, greedy

Gosha is hunting

brute force, data structures, dp, flows, math, probabilities, sortings

Little C Loves 3 II

brute force, constructive algorithms, flows, graph matchings

Fox And Dinner

flows

Delivery Bears

binary search, flows, graphs

Segments Removal

data structures, dsu, flows, implementation, two pointers

Paired Payment

binary search, brute force, constructive algorithms, dp, flows, graphs, shortest paths

Vlad and Trouble at MIT

dfs and similar, dp, flows, graphs, greedy, implementation, trees

Ciel and Duel

dp, flows, greedy

Single-use Stones

binary search, flows, greedy, two pointers

Array and Operations

flows, graph matchings, number theory

Soldier and Traveling

flows, graphs, math

Koxia and Game

constructive algorithms, data structures, dfs and similar, dsu, flows, games, graph matchings, graphs, implementation

Vasya And The Matrix

constructive algorithms, flows, math

Treasure Island

dfs and similar, dp, flows, hashing

Rock, Paper, Scissors

brute force, constructive algorithms, flows, greedy, math

Secret Santa

constructive algorithms, flows, graphs, greedy, math

Armchairs

dp, flows, graph matchings, greedy

Alyona and a Narrow Fridge

binary search, flows, greedy, sortings

Chef Monocarp

dp, flows, graph matchings, greedy, math, sortings

Engineer Artem

2-sat, chinese remainder theorem, constructive algorithms, fft, flows

Qpwoeirut And The City

dp, flows, greedy, implementation

Li Hua and Maze

constructive algorithms, flows, graphs, greedy, implementation

Gregor and the Pawn Game

dfs and similar, dp, flows, graph matchings, graphs, greedy, implementation

Division by Two and Permutation

constructive algorithms, flows, graph matchings, greedy, math