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+### https://theweeklychallenge.org/blog/perl-weekly-challenge-339/
+"""
+
+Task 2: Peak Point
+
+Submitted by: [43]Mohammad Sajid Anwar
+     __________________________________________________________________
+
+   You are given an array of altitude gain.
+
+   Write a script to find the peak point gained.
+
+Example 1
+
+Input: @gain = (-5, 1, 5, -9, 2)
+Output: 1
+
+start: 0
+1st change:  0 + (-5) = -5
+2nd change: -5 + 1    = -4
+3rd change: -4 + 5    = 1
+4th change:  1 + (-9) = -8
+5th change: -8 + 2    = -6
+
+max(0, -5, -4, 1, -8, -6) = 1
+
+Example 2
+
+Input: @gain = (10, 10, 10, -25)
+Output: 30
+
+start: 0
+1st change:  0 + 10    = 10
+2nd change: 10 + 10    = 20
+3rd change: 20 + 10    = 30
+4th change: 30 + (-25) = 5
+
+max(0, 10, 20, 30, 5) = 30
+
+Example 3
+
+Input: @gain = (3, -4, 2, 5, -6, 1)
+Output: 6
+
+start: 0
+1st change:  0 + 3    = 3
+2nd change:  3 + (-4) = -1
+3rd change: -1 + 2    = 1
+4th change:  1 + 5    = 6
+5th change:  6 + (-6) = 0
+6th change:  0 + 1    = 1
+
+max(0, 3, -1, 1, 6, 0, 1) = 6
+
+Example 4
+
+Input: @gain = (-1, -2, -3, -4)
+Output: 0
+
+start: 0
+1st change:  0 + (-1) = -1
+2nd change: -1 + (-2) = -3
+3rd change: -3 + (-3) = -6
+4th change: -6 + (-4) = -10
+
+max(0, -1, -3, -6, -10) = 0
+
+Example 5
+
+Input: @gain = (-10, 15, 5)
+Output: 10
+
+start: 0
+1st change:   0 + (-10) = -10
+2nd change: -10 + 15    = 5
+3rd change:   5 + 5     = 10
+
+max(0, -10, 5, 10) = 10
+     __________________________________________________________________
+
+   Last date to submit the solution 23:59 (UK Time) Sunday 21st September
+   2025.
+     __________________________________________________________________
+
+SO WHAT DO YOU THINK ?
+"""
+### solution by pokgopun@gmail.com
+
+def pp(gain: tuple[int]) -> int:
+    sm = 0
+    mx = sm
+    for n in gain:
+        sm += n 
+        if mx < sm:
+            mx = sm
+    return mx
+
+import unittest
+
+class TestPp(unittest.TestCase):
+    def test(self):
+        for inpt, otpt in {
+                (-5, 1, 5, -9, 2): 1,
+                (10, 10, 10, -25): 30,
+                (3, -4, 2, 5, -6, 1): 6,
+                (-1, -2, -3, -4): 0,
+                (-10, 15, 5): 10,
+                }.items():
+            self.assertEqual(pp(inpt),otpt)
+
+unittest.main()