← CSES Better

Circus

USACO · 2020 · US Open · platinum-3

Open official problem ↗
Ask AI

Open a hint-first prompt in a new AI chat. Grok may ask you to confirm before sending.

Open Claude Desktop

graph-algorithms · trees · data-structures

The organizer’s problem statement is available at the official source link.

sample trace

Circus: graph algorithms walkthrough

Circus: use the linked editorial?s graph algorithms, trees idea on the published sample, then verify the displayed output.

Published input5 1 2 2 3 3 4 3 5 8 1 3 2 3 3 4 4 5 5 6 6 7 6 8modelAlgorithm ideaRepresent the task?s objects and connections as a graph, then use the editorial?s traversal or path method to obtain the requested property.task resultExpected output1 1 3 24 120 1 1 1 6 30 180 5040 40320
  1. 1

    Model

    Make one vertex per task object and add an edge for each permitted relationship.
  2. 2

    Process

    Traverse or relax the graph according to the task?s path or reachability rule.
  3. 3

    Read

    Use the reached set or path result to produce the requested output.
  4. 4

    Verify the sample

    Use the published sample output to check the result of this idea on the displayed input.
Tools
1
2
3
4
5
6
7
8
9
10
11
12
Draft saved locally
|12 lines, 156 chars

Run output

Run your code to see output.