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https://tlx.toki.id/problems/bnpchs-2023-final/B
This question requires you to calculate the combination of two numbers where one ranges from 1 to 100 and the other from 1 to k.
They have also asked to mod the final answer by 1e9+7. How to write code in cases like these?
here ya go: https://cp-algorithms.com/combinatorics/binomial-coefficients.html
thanks a lot!
Do you know what inverse here in the code means?
I tried compiling it and it gives me an error
this is how to find the inverse of a number: https://cp-algorithms.com/algebra/module-inverse.html
right, gotcha
int N_Choose_K(int n, int k, int mod) {
if(k == 1) return n; if(n-k == 1) return n; if(n == k) return 1; return (N_Choose_K(n-1,k,mod) + N_Choose_K(n-1,k-1,mod)) % mod; }https://github.com/sreedhar3210/CP-snippets/blob/main/Combinatorics%20and%20fast%20power
you can refer this code snippet
Thanks a lot, this really helps!