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Codeforces (c) Copyright 2010-2026 Михаил Мирзаянов
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Время на сервере: 04.05.2026 09:35:27 (h1).
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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 ?
Auto comment: topic has been updated by sojabhai (previous revision, new revision, compare).
I think it's the fact that $$$dp[x][lastSeen]$$$ is accessed multiple times in the TLE code (even if it's via a reference variable), and it's probably not cache optimised. Replacing the reference variable with just $$$dp[x][lastSeen]$$$ gives the same TLE result — 271896757
Makes sense , Thanks
Auto comment: topic has been updated by sojabhai (previous revision, new revision, compare).