Gold
The topics below are not exhaustive for this division.
Contest problems may contain topics not covered in the guide, or topics listed under different divisions!
Modules Progress
Problems Progress
Math
Dynamic Programming
Most Gold and Platinum contests have at least one DP problem.
Introduction to DP
Very Frequent
Speeding up naive recursive solutions with memoization.
Updated: Yesterday
Knapsack DP
Not Frequent
Problems that can be modeled as filling a limited-size container with items.
Updated: Yesterday
Paths on Grids
Not Frequent
Counting the number of "special" paths on a grid, and how some string problems can be solved using grids.
Updated: Yesterday
Longest Increasing Subsequence
Has Not Appeared
Finding and using the longest increasing subsequence of an array.
Updated: Yesterday
Bitmask DP
Not Frequent
DP problems that require iterating over subsets.
Updated: Yesterday
Range DP
Rare
Solving a DP problem on every contiguous subarray of the original array.
Updated: Yesterday
Digit DP
Rare
Finding the number of integers in a range that have a property.
Updated: Yesterday
Graphs
Most Silver to Platinum contests have at least one graph problem.
Shortest Paths with Unweighted Edges
Not Frequent
Introduces how BFS can be used to find shortest paths in unweighted graphs.
Updated: Yesterday
Disjoint Set Union
Somewhat Frequent
The Disjoint Set Union (DSU) data structure, which allows you to add edges to a graph and test whether two vertices of the graph are connected.
Updated: Yesterday
Topological Sort
Rare
Ordering the vertices of a directed acyclic graph such that each vertex is visited before its children.
Updated: Yesterday
Shortest Paths with Non-Negative Edge Weights
Not Frequent
Bellman-Ford, Floyd-Warshall, and Dijkstra.
Updated: Yesterday
Minimum Spanning Trees
Not Frequent
Finding a subset of the edges of a connected, undirected, edge-weighted graph that connects all the vertices to each other of minimum total weight.
Updated: Yesterday
Data Structures
More Operations on Sorted Sets
Not Frequent
Finding the next element smaller or larger than a specified key in a sorted set, and using iterators with sorted sets.
Updated: Yesterday
(Optional) Sorted Sets with Custom Comparators
Rare
Incorporating custom comparators into standard library containers.
Updated: Yesterday
Stacks
Rare
A data structure that only allows insertion and deletion at one end.
Updated: Yesterday
Sliding Window
Not Frequent
Maintaining data over consecutive subarrays.
Updated: Yesterday
Point Update Range Sum
Somewhat Frequent
Segment Tree, Binary Indexed Tree, and Order Statistic Tree (in C++).
Updated: Yesterday
Trees
Euler Tour Technique
Not Frequent
Flattening a tree into an array to easily query and update subtrees.
Updated: Yesterday
DP on Trees - Introduction
Not Frequent
Using subtrees as subproblems.
Updated: Yesterday
DP on Trees - Solving For All Roots
Rare
Tree DP problems involving rerooting.
Updated: Yesterday
Additional Topics
Rarely required.
Hashing
Rare
Quickly testing equality of substrings or sets with a small probability of failure.
Updated: Yesterday
(Optional) Hashmaps
Rare
Maintaining collections of distinct elements with hashing.
Updated: Yesterday
Meet In The Middle
Rare
Problems involving dividing the search space into two.
Updated: Yesterday
Optimizing Unimodal Functions
Rare
Using ternary or binary search to find the mode of unimodal functions.
Updated: Yesterday
Conclusion
Congratulations on making it this far!