APIO 2011 How to solve Table Coloring Problem using DFS (Two - Coloring)?

[dsakf_jsaf]

Problem Link: https://usaco.guide/silver/dfs#problem-apio-11-TableColoring
Solution: https://usaco.guide/problems/apio-2011table-coloring/solution

As written in solution this problem can be solved either using DFS or DSU. Since I’m learning DFS (Two - Coloring) in USACO Guide so I would like to solve it using DFS Two-coloring.

I’ve tried to implement it but it failed and got WA on most test cases.

[SansPapyrus683]

How to ask for help on a problem

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[dsakf_jsaf]

I’ve changed the link to the problem to the link from USACO Guide.

Would you help me, please? I really need your help