Solution for problem 30 of Euler Project (#1690)

* Create soln.py

Solution for problem 30 of Euler Project

* Update soln.py

* update soln.py

modified the changes

* if __name__ == "__main__":

Co-authored-by: Christian Clauss <cclauss@me.com>

project_euler/problem_30/soln.py

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+""" Problem Statement (Digit Fifth Power ): https://projecteuler.net/problem=30
+
+Surprisingly there are only three numbers that can be written as the sum of fourth powers of their digits:
+
+1634 = 1^4 + 6^4 + 3^4 + 4^4
+8208 = 8^4 + 2^4 + 0^4 + 8^4
+9474 = 9^4 + 4^4 + 7^4 + 4^4
+As 1 = 1^4 is not a sum it is not included.
+
+The sum of these numbers is 1634 + 8208 + 9474 = 19316.
+
+Find the sum of all the numbers that can be written as the sum of fifth powers of their digits.
+ 
+(9^5)=59,049‬
+59049*7=4,13,343 (which is only 6 digit number )
+So, number greater than 9,99,999 are rejected
+and also 59049*3=1,77,147 (which exceeds the criteria of number being 3 digit)
+So, n>999
+and hence a bound between (1000,1000000)
+"""
+
+
+def digitsum(s: str) -> int:
+    """
+    >>> all(digitsum(str(i)) == (1 if i == 1 else 0) for i in range(100))
+    True
+    """
+    i = sum(pow(int(c), 5) for c in s)
+    return i if i == int(s) else 0
+
+
+if __name__ == "__main__":
+    count = sum(digitsum(str(i)) for i in range(1000,1000000))
+    print(count)  # --> 443839