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A string related question
By emoji, history, 7 years ago, In English

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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7 years ago, # |
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Are you sure it can be done in time complexity better than O(N2)?

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    7 years ago, # ^ |
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    This question is on hackerrank with the same constraints.

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7 years ago, # |
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Use suffix automaton. After build, recalc cnt[i] for all node (cnt[i] = count ways to last node). for all i

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