# Other Resources

 - [USACO -> CPH Topics](https://github.com/bqi343/USACO/blob/master/Contests/USACO%20Links/USACO%20Topics.md)
 - [Riya's website](https://www.vplanetcoding.com/courses)
 - [IOI Syllabus](https://people.ksp.sk/~misof/ioi-syllabus/ioi-syllabus.pdf)
 - [Darren's book](https://www.overleaf.com/project/5e73f65cde1d010001224d8a)
 - [Division-Specific Categorization](https://github.com/bqi343/USACO/blob/master/Contests/USACO%20Links/Division-Specific/Silver.md)
 - [Silver Categorization](https://docs.google.com/document/d/1ba2jr2PFrtxHuGfvdjYVKX-8VzkQAdhpiMLlpXxiAOM/edit)

# Intro

 - [Introduction to Competitive Programming](https://thecodingwizard.github.io/usaco-training-2.0/Intro)
   - Contest Format
   - Choosing a Language
   - Practicing and Debugging
   - Contest Strategies
 - [Prerequisites](https://thecodingwizard.github.io/usaco-training-2.0/Intro_Prerequisites)
 - Introductory Problems
   - Author Note: be explicit about how to implement things (say "arrays" or "for-loops")
   - Author Note: [Fence Painting](http://usaco.org/index.php?page=viewproblem2&cpid=567)
   - Author Note: [Word Processing](http://usaco.org/index.php?page=viewproblem2&cpid=987)
 - Standard Containers Intro

# Bronze

 - Simulation (just do what statement tells you to do)
   - ex. [The Lost Cow](http://usaco.org/index.php?page=viewproblem2&cpid=735)
 - Complete Search
   - ex. [Tracing](http://usaco.org/index.php?page=viewproblem2&cpid=1037)
 - Rectangle Geometry
   - ex. [Billboard](http://usaco.org/index.php?page=viewproblem2&cpid=759)
 - "Observation"
   - basically everything else (requires more thought)
   - ex. [Mad Scientist](http://usaco.org/index.php?page=viewproblem2&cpid=1012)

# Silver

 - Greedy
   - ex?
 - Standard Containers
   - ex?
 - Sorting
   - Binary Search (BinSearch)
     - ex. [Counting Haybales](http://usaco.org/index.php?page=viewproblem2&cpid=666)
   - Two Pointers (2P)
     - ex. [Diamond Collector](http://usaco.org/index.php?page=viewproblem2&cpid=643)
 - Prefix Sums (Psum)
   - ex. [Breed Counting](http://www.usaco.org/index.php?page=viewproblem2&cpid=572)
 - Flood Fill (FF)
   - ex. [Switching on the Lights](http://www.usaco.org/index.php?page=viewproblem2&cpid=570)
   - Occasionally, graph problems appear in bronze ...
 - Permutations 
   - Cycle Decomposition?
   - ex. [Swapity Swapity Swap](http://www.usaco.org/index.php?page=viewproblem2&cpid=1014)

# Gold

 - Dynamic Programming (DP)
   - ex. [Time is Mooney](http://www.usaco.org/index.php?page=viewproblem2&cpid=993)
 - Sliding Window?
   - ex. [Haybale Feast](http://www.usaco.org/index.php?page=viewproblem2&cpid=767)
 - Graphs
   - Breadth First Search (BFS)
     - ex. [Cow Navigation](http://www.usaco.org/index.php?page=viewproblem2&cpid=695)
   - Shortest Path (SP)
     - ex. [Milk Pumping](http://www.usaco.org/index.php?page=viewproblem2&cpid=969)
   - Minimum Spanning Tree (MST)
     - Disjoint Set Union (DSU)
     - ex. [Fencedin](http://www.usaco.org/index.php?page=viewproblem2&cpid=623)
   - Topological Sort (TopoSort)
     - ex. [Timeline](http://www.usaco.org/index.php?page=viewproblem2&cpid=1017)
 - [Range Sum Queries with Point Updates](https://thecodingwizard.github.io/usaco-training-2.0/Gold_1DRQ)
   - ex. [Haircut](http://www.usaco.org/index.php?page=viewproblem2&cpid=1041)
 - Number Theory
   - ex. [Cow Poetry](http://usaco.org/index.php?page=viewproblem2&cpid=897)
 - Geometry
   - ex. ?
 - Strings
   - Trie?
   - Hashing
   - ex. [Cownomics](http://www.usaco.org/index.php?page=viewproblem2&cpid=741)
 - Combinatorics
   - Principle of Inclusion and Exclusion (PIE)
   - ex. [Cowpatibility](http://usaco.org/index.php?page=viewproblem2&cpid=862)

# Platinum

Just a sampling of the many possible topics.

 - Trees
   - Lowest Common Ancestor (LCA)
     - mostly platinum but may appear in gold as well
     - ex. [cowland](http://www.usaco.org/index.php?page=viewproblem2&cpid=921)
 - Range Queries
   - Segment Tree
     - possibly useful for gold
   - Static Array Queries
   - 2D
 - Bitset
 - Slope Trick
 - Fracturing Search