[Video Tutorial Series] Graph Theory: From Beginner to Intermediate - Dardev
I am planning to post all solutions of CSES graph series ; while also discussing the necessary theory involved.
Update: I reuploaded the first 12 videos with better audio quality . All audios are good now.
Here is the entire playlist: Graph Theory Introduction Part 1 :: Overview and Representations of Graph - YouTube
Intro part 1: Graph Theory Introduction Part 1 :: Overview and Representations of Graph - YouTube
Intro part 2: Graph Theory Introduction Part 2 :: DFS and BFS - YouTube
CSES 1: Counting Rooms(1192): Graph 01: Counting Rooms (CSES 1192) :: Graph Theory: Flood Fill, DFS on a Grid, CSES 01 - YouTube
CSES 2: Labyrinth(1193): Graph 06: Labyrinth:: BFS on a Grid (CSES Graph 02: 1193) - YouTube
CSES 3: Building Roads: Graph 02: Building Roads :: Min Cost to Connect Graph with Unweighted Edges. (CSES Graph 03: 1666) - YouTube
CSES 4: Message Route Graph 05: Message Route :: BFS in Undirected. Single Source Shortest Path. (CSES Graph 04: 1667) - YouTube
CSES 5: Building Teams: Graph 03: Building Teams :: Graph Theory: Bipartite Graph, 2 Color Problem, CSES Graphs 05: 1668 - YouTube
CSES 6: Round Trip: Graph 04: Round Trip :: Cycle Retrieval, Cycle Detection, Undirected Graph, CSES 06: 1669 - YouTube
CSES 7: Monsters: Graph 07: Monsters :: Lava Flow, Multi-source BFS, BFS on a Grid (CSES 07: 1194) - YouTube
Theory Time: Heaps Part 1 — Intro to Heaps, Trees, Rooting a Tree, Binary Tree, Complete Binary Tree Graph 8.1: Heaps 1:: Intro to Heaps, Trees, Rooting a Tree, Binary Tree, Complete Binary Tree - YouTube
Theory Time: Heaps Part 2 — Inserting, Retrieving, Heapfication into Heap Graph 8.2: Heaps 2:: Inserting into, Retrieving from a Binary Min Heap. Heapfication. - YouTube
Theory Time: Heaps Part 3 — Flattening Heap into Vector. Navigating a Flattened Tree Graph 8.3: Heaps 3:: Flattening Heap into Vector. Navigating a Flattened Tree - YouTube
CSES 8: Shortest Routes I: 09 Graph Theory:: Dijkstra's Algorithm with CSES 08 Shortest Routes I (1671) - YouTube
CSES 9: Shortest Routes II: 11 Graph Theory:: Floyd Warshalls with CSES 9 Shortest Routes II (1672) All Source Shortest Paths - YouTube
CSES 10: High Score: 10 Graph Theory:: Bellman Ford's Algorithm with CSES 10 High Score (1673) - YouTube
CSES 11: Flight Discount: 12 Graph Theory:: Dijkstras with CSES 11 Flight Discount (1195) Single Source Shortest Path Modified - YouTube
CSES 12: Cycle Finding: 14 Graph Theory:: Bellman-Ford with CSES 12 Cycle Finding (1197) Retrieve Negative Cycle - YouTube
CSES 13: Flight Routes: 13 Graph Theory:: Dijkstras with CSES 13 Flight Routes (1196) Single Source Shortest PathS Modified - YouTube
CSES 14: Round Trip II: 15 Graph Theory:: DFS with Stack to Retrieve Cycle in Directed Graph CSES Round Trip II 1678 - YouTube
CSES 15: Course Schedule: 16 Graph Theory:: Topological Sort with CSES: Course Schedule 1679 - YouTube
CSES 16: Longest Flight Route: Graph 17: Longest Flight Route :: Modified Dijkstras(CSES 16: 1680) - YouTube
CSES 17: Game Routes: Graph 19: Game Routes:: Topological Sorting(CSES 17: 1681) - YouTube
CSES 18: Investigation: Graph 18: Investigation:: Modified Dijkstras(CSES 18: 1202) - YouTube
CSES 19: Planet Queries I
Planet Queries II
Very underrated. Your explanations are amazing!
I liked how you submitted your single source BFS code to prove that it won’t work.
Thanks! I am glad you are following the series.
Here are the updates:
I solved another CSES problem: Lava Flow and Multisource BFS - YouTube
Introduction to Trees, Binary Trees, Min/Max Heaps, Flattening a Tree into a Vector - YouTube
I made an introductory video 00 to make things even simpler - YouTube
I am reuploading the solution to the first problem, for greater audio clarity and better explanation/presentation - YouTube
Today I will try and share Dijkstra theory while solving the next CSES problem.
Language dependent or independent videos ?
I explain concepts in English. But my implementation is in C++, I explain every critical aspect of code though. Just check it out, you’ll like it.
This video series is really helpful! I am really excited about this series and will keep posting updates to support you. I just finished the first two videos. Nice explanation of BFS and DFS on the grid.
Thanks a lot for you effort and hard work. It is really helpful for the coding comminity.
Thank you guys. Please subscribe! Its a humble request . Will post more videos soon.
Hey please try to make a few more videos on Dijkstra algo, with some interesting problems
Done with Dijkstra:: 09 Graph Theory:: Dijkstra's Algorithm with CSES 08 Shortest Routes I (1671) - YouTube
Do give feedback, please!
I will be adding Bellman-Ford and solving more problems starting tomorrow.
Please keep following this series to improve your understanding of graph theory.
Hey, can you help me with this problem?
Check out my DFS
See what i did there? I created a global vector idx and did the following to track the edge being currently explored.
When I come back, I don’t start checking ALL neighbours of vertex ‘u’. I simply continue from where I left. Hope that makes sense?
If we don’t take care of this, we will search ALL edges every time in the following case. I am calling this graph a flower-with-petal graph. Only seven petals in this graph, but imagine what happens if there are 10^5 petals (with O(N^2) complexity)
If it doesn’t I am not going to type out more here. I try to make a Eulerian Circuit video on priority and explain this aspect clearly.
Watch out for this video series: - YouTube
Hey guys! Just solved another problem for you guys: High Score and this time we study the “Bellman-Ford” Algorithm.
Hope you’ll love it.
one of the best graph theory tutorial is by Code N Code
Atcoder ABC #346 Solution Discussion
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Round Trip CSES problem
This solution is giving wrong answer in 3 test cases which are very large and i am unable to debug those Please Help....;)
CSES Problem Set
Round trip ii.
- Time limit: 1.00 s
- Memory limit: 512 MB
Byteland has n cities and m flight connections. Your task is to design a round trip that begins in a city, goes through one or more other cities, and finally returns to the starting city. Every intermediate city on the route has to be distinct.
The first input line has two integers n and m : the number of cities and flights. The cities are numbered 1,2,\dots,n .
Then, there are m lines describing the flights. Each line has two integers a and b : there is a flight connection from city a to city b . All connections are one-way flights from a city to another city.
First print an integer k : the number of cities on the route. Then print k cities in the order they will be visited. You can print any valid solution.
If there are no solutions, print "IMPOSSIBLE".
Constraints
- 1 \le n \le 10^5
- 1 \le m \le 2 \cdot 10^5
- 1 \le a,b \le n
Graph Algorithms
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USACO Forum
Distinct colors - cses.
I was trying to solve a question on cses - Distinct Colors , My solution based on the book Competitive Programmer’s Handbook by Antti Laaksonen page number 170(Merging data structures)
What I want to know is that when I swap the two maps in the above code using
The code gets Accepted , but when I do not swap these maps I get a TLE , here is a quote from the book :
The merging of nodes can be done as follows: We go through the children of s and at each child u merge d[ s ] and d[ u ]. We always copy the contents from d[ u ] to d[ s ]. However, before this, we swap the contents of d[ s ] and d[ u ] if d[ s ] is smaller than d[ u ]. By doing this, each value is copied only O(log(n)) times during the tree traversal, which ensures that the algorithm is efficient.
how does swapping the maps according to their size ensures that each element would be at most copied O(log(N)) times?
If all the colors are unique, then the complexity to copy one map to another would-be O(N) right? That would make total complexity O(N^2) .
Apelsin Hotel
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A topological sort of a directed acyclic graph is a linear ordering of its vertices such that for every directed edge u\to v u → v from vertex u u to vertex v v, u u comes before v v in the ordering. There are two common ways to topologically sort, one involving DFS and the other involving BFS. Resources. CSA. Topological Sorting.
Byteland has n cities and m roads between them. Your task is to design a round trip that begins in a city, goes through two or more other cities, and finally...
1741 - Area of Rectangles. 2429 - Grid Completion. 1752 - Creating Offices. 1075 - Permutations II. 2415 - Functional Graph Distribution. 1685 - New Flight Routes. 2418 - Grid Path Construction. Accepted solutions of CSES problemset. Contribute to mrsac7/CSES-Solutions development by creating an account on GitHub.
Editorial for Flight Route Check. Ques LinK. Run the dfs from any node and then check all nodes are visited or not. if any node is not visited, u will get the answer. Also check is there any node is present in graph whose outdegree is zero. if yes then u can visited from this node to any node. Else the answer is YES.
A free collection of curated, high-quality competitive programming resources to take you from USACO Bronze to USACO Platinum and beyond. Written by top USACO Finalists, these tutorials will guide you through your competitive programming journey. ... CSES - Flight Routes Check. Authors: Michael Cao, Nathan Gong. Language: All. Edit This Page ...
CSES 14: Round Trip II: 15 Graph Theory:: DFS with Stack to Retrieve Cycle in Directed Graph CSES Round Trip II 1678 - YouTube. CSES 15: Course Schedule: 16 Graph Theory:: Topological Sort with CSES: Course Schedule 1679 - YouTube. CSES 16: Longest Flight Route: Graph 17: Longest Flight Route :: Modified Dijkstras(CSES 16: 1680) - YouTube
Your task is to design a round trip that begins in a city, goes through two or more other cities, and finally returns to the starting city. Every intermediate city on the route has to be distinct. Input. The first input line has two integers n and m: the number of cities and roads. The cities are numbered 1,2,\dots,n.
Before contest Codeforces Round 936 (Div. 2) 2 days Register now ... xiaowuc1 → USACO 2023-2024 US Open . E869120 → JOI Spring Training 2024 Online Contest . ... Round Trip CSES problem. By BabaYaga_59, history, 3 years ago, ...
{"payload":{"allShortcutsEnabled":false,"fileTree":{"src":{"items":[{"name":"1068 - Weird Algorithm.cpp","path":"src/1068 - Weird Algorithm.cpp","contentType":"file ...
Your task is to design a round trip that begins in a city, goes through one or more other cities, and finally returns to the starting city. Every intermediate city on the route has to be distinct. Input. The first input line has two integers n and m: the number of cities and flights. The cities are numbered 1,2,\dots,n.
new BufferedReader(new InputStreamReader(System.in)); PrintWriter out = new PrintWriter(System.out); A free collection of curated, high-quality competitive programming resources to take you from USACO Bronze to USACO Platinum and beyond. Written by top USACO Finalists, these tutorials will guide you through your competitive programming journey.
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https://cses.fi/problemset/task/1164 In this problem, why do we sort by starting time? The classic scheduling problem usually has us schedule by the end time, so I ...
A free collection of curated, high-quality competitive programming resources to take you from USACO Bronze to USACO Platinum and beyond. Written by top USACO Finalists, these tutorials will guide you through your competitive programming journey. ... CSES - Flight Routes. Author: Benjamin Qi. Language: All. Edit This Page. Appears In. Gold ...
(Simplify your booking process with our one-stop booking service on Trip.com) Destination. Elektrostal' Check-in. 0 nights. Check-out. Rooms and Guests. 1 room, 2 adults, 0 children. Update. All Properties in Elektrostal' Apelsin Hotel. Noginskoye Shosse 36B, Elektrostal', Moscow region, Russia Show on Map.
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Written by top USACO Finalists, these tutorials will guide you through your competitive programming journey. A free collection of curated, high-quality competitive programming resources to take you from USACO Bronze to USACO Platinum and beyond. ... CSES - Game Routes. Authors: Andrew Wang, Sofia Yang. Language: All. Edit This Page. Appears In ...
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USACO Forum. General Questions. kushagra December 3, 2020, 8:15am #1. I was trying to solve a question on cses - Distinct Colors, My solution based on the book Competitive Programmer's Handbook by Antti Laaksonen page number 170 (Merging data structures) #include<bits/stdc++.h> using namespace std; const int Mxn = 2e5; unordered_set<int> adj ...
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