From 85ed7471710a756f2ab4fb82d9da5cd427d8fd0e Mon Sep 17 00:00:00 2001
From: heoh <h0h6h2h5@gmail.com>
Date: Tue, 7 Mar 2023 21:41:01 +0900
Subject: [PATCH 1/2] Strange Printer: Wrong Answer

---
 heoh/leetcode-664.py | 49 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 heoh/leetcode-664.py

diff --git a/heoh/leetcode-664.py b/heoh/leetcode-664.py
new file mode 100644
index 0000000..a8da115
--- /dev/null
+++ b/heoh/leetcode-664.py
@@ -0,0 +1,49 @@
+class Solution:
+    def strangePrinter(self, s: str) -> int:
+        return min(self.strangePrinter2(s), self.strangePrinter2(s[::-1]))
+
+    def strangePrinter2(self, s: str) -> int:
+        scope_right_stack = []
+
+        print_cnt = 0
+        paper = '_' * len(s)
+
+        scope_left = 0
+        scope_right = len(s)
+        scope_right_stack.append(scope_right)
+
+        for i in range(len(s)):
+            if s[i] == paper[i]:
+                continue
+
+            left_char = s[i]
+            scope_left = i
+            while scope_right <= scope_left:
+                scope_right_stack.pop()
+                scope_right = scope_right_stack[-1]
+
+            scope_right = s.rindex(left_char, scope_left, scope_right)
+            scope_right_stack.append(scope_right)
+            
+            paper = self.print(paper, scope_left, scope_right, left_char)
+            print_cnt += 1
+
+        return print_cnt
+
+
+
+    def print(self, paper, left, right, char):
+        return paper[:left] + char * (right - left + 1) + paper[right+1:]
+
+
+def main():
+    assert Solution().strangePrinter('tbgtgb') == 4
+    assert Solution().strangePrinter('abc') == 3
+    assert Solution().strangePrinter('aaabbb') == 2
+    assert Solution().strangePrinter('aba') == 2
+    assert Solution().strangePrinter('aabbaabbaa') == 3
+    assert Solution().strangePrinter('aabbaabbccaabbccbbaabbccaa') == 8
+
+
+if __name__ == '__main__':
+    main()

From 6492959ba4dfb16e298b3064a0ee9032507a1012 Mon Sep 17 00:00:00 2001
From: heoh <h0h6h2h5@gmail.com>
Date: Tue, 7 Mar 2023 22:09:32 +0900
Subject: [PATCH 2/2] Strange Printer: Wrong Answer 2

---
 heoh/leetcode-664.py | 29 ++++++++++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/heoh/leetcode-664.py b/heoh/leetcode-664.py
index a8da115..c0e4f4b 100644
--- a/heoh/leetcode-664.py
+++ b/heoh/leetcode-664.py
@@ -1,6 +1,32 @@
 class Solution:
     def strangePrinter(self, s: str) -> int:
-        return min(self.strangePrinter2(s), self.strangePrinter2(s[::-1]))
+        # aaaaabbbbbbccccccaaaaaa -> abca
+        ss = s[0]
+        for c in s[1:]:
+            if c != ss[-1]:
+                ss += c
+        s = ss
+
+        cost = {}
+        for i in range(len(s)):
+            for j in range(len(s) + 1):
+                if i < j:
+                    cost[i, j] = self.strangePrinter2(s[i:j])
+        
+        cache = {}
+        def div_and_conq(i, j):
+            if (i, j) in cache:
+                return cache[i, j]
+            
+            best = cost[i, j]
+            for m in range(i+1, j):
+                cur_cost = div_and_conq(i, m) + div_and_conq(m, j)
+                best = min(best, cur_cost)
+            
+            cache[i, j] = best
+            return cache[i, j]
+
+        return div_and_conq(0, len(s))
 
     def strangePrinter2(self, s: str) -> int:
         scope_right_stack = []
@@ -43,6 +69,7 @@ def main():
     assert Solution().strangePrinter('aba') == 2
     assert Solution().strangePrinter('aabbaabbaa') == 3
     assert Solution().strangePrinter('aabbaabbccaabbccbbaabbccaa') == 8
+    assert Solution().strangePrinter('baacdddaaddaaaaccbddbcabdaabdbbcdcbbbacbddcabcaaa') == 19
 
 
 if __name__ == '__main__':