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You forgot about memoization in dfs.
The whole point of using reference variable is memoisation itself
Sorry, idk what is this. Im not c++ guru :( My thought is that linking and unlinking variable is time consuming and not O(1).Because you first allocate space in the heap and create a connection, then cut it off, which gives additional costs both in memory and time. So its causing tle.
Source ?
I only have link to Russian c# video. I think you dont need it. Its just base knowledge about struct, collections,heap,stack and how reference and pointers work.