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In english tutorial of https://codeforces.me/contest/460/problem/A, it is given that answer can be calculated using formula
, but I am not able to understand how we reached at this formula. Please help me in this.
Here is my accepted submission , but my solution will exceed time limit if value of n is very large. Fortunately in this question input size limit is very small, hence my solution works.
How to find all occurences of each substring in the given string.Please give me some suggestions
((n+m)Cn) %mod here n and m can be upto 10^9 and mod is 10^6+3. Can someone help me in this calculating the correct answer
