Hi cf community! I m having hard time with graphs and trees problems. I need a problemset which have tutorials with good explanation. i think many of the coders also wants to master graphs/trees but they are not getting good content.so it will be helpful if you add list of problems which help me and others to master these topics.

if first we see some video tutorial and solved questions with good explanation , it will help us to build our approach towards these question ,so if u know about some video tutorial where they have solved some nice problems ,please attach link of them too.

Thanks in advance!! Happy coding!!

https://cses.fi/problemset/task/1193

in this problem i m able to find out the minimum number of moves to get to the destination,but how to trace the path ,how to find string with shortest path. pls help!!
spookywooky -Baba_Yaga

https://cses.fi/problemset/task/1671/

I m getting tle in only 2 test cases of this problem. here's my code link--

https://ideone.com/SEcRXD

need help!!****