Recently I learn dfs, bipartite graph /bicoloring graph.I solved 4-5 problems on this topic. Can you suggest some CF problem on this topic?
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(topological sort, maybe learn this before trying a problem)
https://www.eolymp.com/en/problems/4002, https://www.eolymp.com/en/problems/2270, https://www.eolymp.com/en/problems/8761, https://www.eolymp.com/en/problems/1390, https://www.eolymp.com/en/problems/2590, https://www.eolymp.com/en/problems/2168, https://www.eolymp.com/en/problems/1063, https://www.eolymp.com/en/problems/9654, https://www.eolymp.com/en/problems/1685, https://www.eolymp.com/en/problems/7024, https://www.eolymp.com/en/problems/7945, https://www.eolymp.com/en/problems/4004, https://www.eolymp.com/en/problems/7034, https://www.eolymp.com/en/problems/3165.