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Selecting an IDE
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Combinatorics
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Geometry
Geometry BasicsVectorsCross and Dot ProductLinesPolygonsAnglesPoint in PolygonDistances and Intersection PointsConvex HullCircles
Recursion
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Dynamic Programming
About DPTree DPBitmask DPDigit DP
Graph Theory
GraphsDFS and BFSShortest PathsTreesTopological SortingDijkstra's AlgorithmMinimum Spanning TreesShortest Path Algorithms
Advanced Graph Theory
BiconnectivityStrongly Connected ComponentsBipartite GraphGraph FlowAugmenting PathsFlow - Minimum Cut DualityHeavy-Light DecompositionCentroid Decomposition
Advanced Data Structures
2D and 3D Segment TreesLazy PropagationImplicit Segment TreesPersistent Segment TreesLowest Common AncestorTrieBalanced Binary Search TreesMo's Algorithm

Selecting an IDE

In this intro lesson, before writing any code, we will learn how to run our program

The simplest solution is to use an online compiler like OnlineGDB.

In order to run code, simply press the run button

The OnlineGDB web IDE with a Hello World C++ program open, and a red arrow pointing at the green Run button in the toolbar

Whilst online gdb is great, most people like having an installed app, and running code locally.

Some popular choices for an IDE include:

Code::Blocks
Dev-C++
Visual studio Code

If you are planning to go to an in-person competition most organizers have an editor of choice you can look at and get used to beforehand.