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+### https://theweeklychallenge.org/blog/perl-weekly-challenge-258/
+"""
+
+Task 2: Sum of Values
+
+Submitted by: [43]Mohammad Sajid Anwar
+     __________________________________________________________________
+
+   You are given an array of integers, @int and an integer $k.
+
+   Write a script to find the sum of values whose index binary
+   representation has exactly $k number of 1-bit set.
+
+Example 1
+
+Input: @ints = (2, 5, 9, 11, 3), $k = 1
+Output: 17
+
+Binary representation of index 0 = 0
+Binary representation of index 1 = 1
+Binary representation of index 2 = 10
+Binary representation of index 3 = 11
+Binary representation of index 4 = 100
+
+So the indices 1, 2 and 4 have total one 1-bit sets.
+Therefore the sum, $ints[1] + $ints[2] + $ints[3] = 17
+
+Example 2
+
+Input: @ints = (2, 5, 9, 11, 3), $k = 2
+Output: 11
+
+Example 3
+
+Input: @ints = (2, 5, 9, 11, 3), $k = 0
+Output: 2
+     __________________________________________________________________
+
+   Last date to submit the solution 23:59 (UK Time) Sunday 1st March 2024.
+     __________________________________________________________________
+
+SO WHAT DO YOU THINK ?
+"""
+### solution by pokgopun@gmail.com
+
+def SOV(ints: tuple, k: int):
+    return sum(
+            ints[i] for i in range(len(ints))
+            if sum(
+                int(e) for e in bin(i).lstrip('0b')
+                ) == k
+           )
+import unittest
+
+class TestSOV(unittest.TestCase):
+    def test(self):
+        for (ints, k), otpt in {
+                ((2, 5, 9, 11, 3), 1): 17,
+                ((2, 5, 9, 11, 3), 2): 11,
+                ((2, 5, 9, 11, 3), 0): 2,
+                }.items():
+            self.assertEqual(SOV(ints,k),otpt)
+
+unittest.main()