2 files changed, 183 insertions, 0 deletions
diff --git a/challenge-342/pokgopun/python/ch-1.py b/challenge-342/pokgopun/python/ch-1.py
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+### https://theweeklychallenge.org/blog/perl-weekly-challenge-342/
+"""
+
+Task 1: Balance String
+
+Submitted by: [46]Mohammad Sajid Anwar
+     __________________________________________________________________
+
+   You are given a string made up of lowercase English letters and digits
+   only.
+
+   Write a script to format the give string where no letter is followed by
+   another letter and no digit is followed by another digit. If there are
+   multiple valid rearrangements, always return the lexicographically
+   smallest one. Return empty string if it is impossible to format the
+   string.
+
+Example 1
+
+Input: $str = "a0b1c2"
+Output: "0a1b2c"
+
+Example 2
+
+Input: $str = "abc12"
+Output: "a1b2c"
+
+Example 3
+
+Input: $str = "0a2b1c3"
+Output: "0a1b2c3"
+
+Example 4
+
+Input: $str = "1a23"
+Output: ""
+
+Example 5
+
+Input: $str = "ab123"
+Output: "1a2b3"
+
+Task 2: Max Score
+"""
+### solution by pokgopun@gmail.com
+
+def bs(string: str) -> str:
+    chars = sorted(string + "_")
+    m = chars.index("_")
+    l = len(string)
+    d = l - 2*m
+    match d:
+        case 0:
+            return "".join( chars[i] + chars[m+i+1] for i in range(m) )
+        case 1:
+            return "".join( chars[m+i+1] + chars[i] for i in range(m) ) + chars[l]
+        case -1:
+            return "".join( chars[i] + chars[m+i+1] for i in range(m-1) ) + chars[m-1]
+    return ""
+
+import unittest
+
+class TestBs(unittest.TestCase):
+    def test(self):
+        for inpt, otpt in {
+                "a0b1c2": "0a1b2c",
+                "abc12": "a1b2c",
+                "0a2b1c3": "0a1b2c3",
+                "1a23": "",
+                "ab123": "1a2b3",
+                }.items():
+            self.assertEqual(bs(inpt),otpt)
+
+unittest.main()
diff --git a/challenge-342/pokgopun/python/ch-2.py b/challenge-342/pokgopun/python/ch-2.py
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+++ b/challenge-342/pokgopun/python/ch-2.py
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+### https://theweeklychallenge.org/blog/perl-weekly-challenge-342/
+"""
+
+Task 2: Max Score
+
+Submitted by: [47]Mohammad Sajid Anwar
+     __________________________________________________________________
+
+   You are given a string, $str, containing 0 and 1 only.
+
+   Write a script to return the max score after splitting the string into
+   two non-empty substrings. The score after splitting a string is the
+   number of zeros in the left substring plus the number of ones in the
+   right substring.
+
+Example 1
+
+Input: $str = "0011"
+Output: 4
+
+1: left = "0", right = "011" => 1 + 2 => 3
+2: left = "00", right = "11" => 2 + 2 => 4
+3: left = "001", right = "1" => 2 + 1 => 3
+
+Example 2
+
+Input: $str = "0000"
+Output: 3
+
+1: left = "0", right = "000" => 1 + 0 => 1
+2: left = "00", right = "00" => 2 + 0 => 2
+3: left = "000", right = "0" => 3 + 0 => 3
+
+Example 3
+
+Input: $str = "1111"
+Output: 3
+
+1: left = "1", right = "111" => 0 + 3 => 3
+2: left = "11", right = "11" => 0 + 2 => 2
+3: left = "111", right = "1" => 0 + 1 => 1
+
+Example 4
+
+Input: $str = "0101"
+Output: 3
+
+1: left = "0", right = "101" => 1 + 2 => 3
+2: left = "01", right = "01" => 1 + 1 => 2
+3: left = "010", right = "1" => 2 + 1 => 3
+
+Example 5
+
+Input: $str = "011101"
+Output: 5
+
+1: left = "0", right = "11101" => 1 + 4 => 5
+2: left = "01", right = "1101" => 1 + 3 => 4
+3: left = "011", right = "101" => 1 + 2 => 3
+4: left = "0111", right = "01" => 1 + 1 => 2
+5: left = "01110", right = "1" => 2 + 1 => 3
+     __________________________________________________________________
+
+   Last date to submit the solution 23:59 (UK Time) Sunday 12th October
+   2025.
+     __________________________________________________________________
+
+SO WHAT DO YOU THINK ?
+"""
+### solution by pokgopun@gmail.com
+
+def ms(string: str) -> int:
+    return max( string[:i].count("0") + string[i:].count("1") for i in range(1,len(string)) )
+    '''
+    l = len(string)
+    sm = 0
+    off = [False for i in range(l)]
+    for i in range(l):
+        if string[i] == "0":
+            sm += 1
+        else:
+            off[i] = True
+    mx = 0
+    while l > 1:
+        l -= 1
+        if off[l]:
+            sm += 1
+        else:
+            sm -= 1
+        if mx < sm:
+            mx = sm
+    return mx
+    '''
+
+import unittest
+
+class TestMs(unittest.TestCase):
+    def test(self):
+        for inpt, otpt in {
+                "0011": 4,
+                "0000": 3,
+                "1111": 3,
+                "0101": 3,
+                "011101": 5,
+                "011111011111011111011111011111011111011111011111011111011111011111011111011111011111011111011111011111": 86,
+                }.items():
+            self.assertEqual(ms(inpt),otpt)
+
+unittest.main()