Given two integers x and n, we need to find number of ways to express x as sum of n-th powers of unique natural numbers. It is given that 1 <= n <= 20.
Input : x = 100 n = 2 Output : 3 Explanation: There are three ways to express 100 as sum of natural numbers raised to power 2. 100 = 10^2 = 8^2+6^2 = 1^2+3^2+4^2+5^2+7^2 Input : x = 100 n = 3 Output : 1 Explanation : The only combination is, 1^3 + 2^3 + 3^3 + 4^3
We use recursion to solve the problem. We first check one by one that the number is included in summation or not.
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