How to find the sum of length of Longest Common Prefixes of all pairs of substrings of a given string. For eg answer for string "aba" is 8. |S|<=1e5.
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Codeforces (c) Copyright 2010-2026 Mike Mirzayanov
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Are you sure it can be done in time complexity better than O(N2)?
This question is on hackerrank with the same constraints.
Use suffix automaton. After build, recalc cnt[i] for all node (cnt[i] = count ways to last node).
for all i