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My solution — http://p.ip.fi/3RFY
Here i used dp approach (dp[i][j] where i = length of the substring , j = index of the substring ending with), passes all the sample test cases but getting segmentation fault in all the other test cases , Please look my code and tell my mistake.
Sorry for my bad english. Thank you .
$$$N$$$ can be as large as $$$ 2*10^6 $$$.
You cannot reserve enough space for a 2 dimensional DP array.
You can solve this problem with String Hashing, answering each query in $$$O(1)$$$.
This is a good resource for String hashing, the problem you are trying to solve is almost same as Problem 2 in the link.