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CSES Problems

114+ posts

CSES Solutions - Even Outdegree Edges

Last Updated: 23 July 2025

Given an undirected graph, your task is to choose a direction for each edge so that in the resulting directed graph's each node has an even outdegree. The outdegree of a n...read more

CSES Solutions - Multiplication Table

Last Updated: 23 July 2025

Find the middle element when the numbers in an n × n multiplication table are sorted in increasing order. It is assumed that n is odd.For example, the 3 × 3 multiplication...read more

CSES Solutions - Acyclic Graph Edges

Last Updated: 25 June 2024

Given an undirected graph, the task is to choose a direction for each edge so that the resulting directed graph is acyclic. You can print any valid solution.Example:Input:...read more

CSES Solutions - Forest Queries

Last Updated: 23 July 2025

Given an N X N grid representing the map of a forest. Each square is either empty or contains a tree. The upper-left square has coordinates (1,1), and the lower-right squa...read more

CSES Solutions - Distance Queries

Last Updated: 23 July 2025

Given a tree consisting of n nodes. The task is to process q queries of the form: What is the distance between nodes a and b?Examples:Input: n = 5, q = 2, edges = {{1, 2},...read more

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CSES Solutions - Company Queries II

Last Updated: 23 July 2025

A company has n employees, who form a tree hierarchy where each employee has a boss, except for the general director. Your task is to process q queries of the form: who is...read more

CSES Solutions - Creating Strings II

Last Updated: 23 July 2025

Given a string, your task is to calculate the number of different strings that can be created using its characters.Examples:Input: S = "aa"Output: 1Explanation: There is o...read more

CSES Solutions - Swap Game

Last Updated: 23 July 2025

You are given a 3X3 grid containing the numbers 1,2...9. Your task is to perform a sequence of moves so that the grid will look like this:1 2 34 5 67 8 9On each move, you...read more

CSES Solutions - Another Game

Last Updated: 17 May 2024

There are n heaps of coins and two players who move alternately. On each move, a player selects some of the nonempty heaps and removes one coin from each heap. The player ...read more

CSES Solutions - Prüfer Code

Last Updated: 23 July 2025

A Prüfer code of a tree of n nodes is a sequence of n-2 integers that uniquely specifies the structure of the tree. The code is constructed as follows: As long as there ar...read more

CSES Solutions – Course Schedule

Last Updated: 23 July 2025

You have to complete n courses. There are m requirements of form "course a has to be completed before course b". Your task is to find an order in which you can complete th...read more

CSES Solutions – Cycle Finding

Last Updated: 23 July 2025

Given a directed graph with N nodes and M edges determine if there exists a negative cycle in the graph. If a negative cycle exists print "YES" and output any vertex seque...read more

CSES Solutions - Tree Distances II

Last Updated: 23 July 2025

You are given a tree consisting of n nodes. Your task is to determine for each node the sum of the distances from the node to all other nodes.Example:Input: edges = { { 1,...read more

CSES Solutions – Labyrinth

Last Updated: 23 July 2025

You are given a map of a labyrinth, and your task is to find a path from start to end. You can walk left, right, up and down.The first input line has two integers n and m:...read more

CSES Solutions – Distributing Apples

Last Updated: 23 July 2025

There are n children and m apples that will be distributed to them. Your task is to count the number of ways this can be done.Examples:Input: n = 3, m = 2Output: 6Explanat...read more

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