Medium Accuracy: 32.71%
Submissions: 83604 Points: 4
Given two integers n and r, find nCr. Since the answer may be very large, calculate the answer modulo 109+7.
Example 1:
Input: n = 3, r = 2
Output: 3
Explaination:3C2 = 3.
Example 2:
Input: n = 2, r = 4
Output: 0
Explaination:ris greater than n.
Your Task:
You do not need to take input or print anything. Your task is to complete the function nCr() which takes n and r as input parameters and returns nCr modulo 109+7..
Expected Time Complexity: O(n*r) Expected Auxiliary Space: O(r)
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Avoid using static/global variables in coding problems as your code is tested
against multiple test cases and these tend to retain their previous values.
Passing the Sample/Custom Test cases in coding problems does not guarantee the
correctness of code. On submission, your code is tested against multiple test cases
consisting of all possible corner cases and stress constraints.
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