Dec 17

Author: siddydutta

2024-12-December-LeetCoding-Challenge/Construct String With Repeat Limit.py

@@ -0,0 +1,51 @@
+from collections import Counter
+from heapq import heapify, heappop, heappush
+from typing import List, Optional, Tuple
+
+
+class Solution:
+    def __heappop(self, heap: List[int]) -> Tuple[Optional[str], int]:
+        if len(heap) == 0:
+            return (None, 0)
+        asc, count = heappop(heap)
+        ch = chr(-asc)
+        return (ch, count)
+
+    def __heappush(self, heap: List[int], ch: str, count: int):
+        if count == 0:
+            return
+        entry = (-ord(ch), count)
+        heappush(heap, entry)
+
+    def repeatLimitedString(self, s: str, repeatLimit: int) -> str:
+        freq = [(-ord(ch), count) for ch, count in Counter(s).items()]
+        heapify(freq)
+        string = ''
+        while freq:
+            curr_ch, curr_count = self.__heappop(freq)
+            if string and string[-1] == curr_ch:
+                next_ch, next_count = self.__heappop(freq)
+                if next_ch is None and next_count == 0:
+                    break
+                string += next_ch
+                self.__heappush(freq, next_ch, next_count-1)
+                self.__heappush(freq, curr_ch, curr_count)
+            else:
+                repeat = min(curr_count, repeatLimit)
+                string += (curr_ch * repeat)
+                self.__heappush(freq, curr_ch, curr_count-repeat)
+        return string
+
+
+def main():
+    s = 'cczazcc'
+    repeatLimit = 3
+    assert Solution().repeatLimitedString(s, repeatLimit) == 'zzcccac'
+
+    s = 'aababab'
+    repeatLimit = 2
+    assert Solution().repeatLimitedString(s, repeatLimit) == 'bbabaa'
+
+
+if __name__ == '__main__':
+    main()

2024-12-December-LeetCoding-Challenge/README.md

@@ -19,7 +19,7 @@
 | December 14 | [2762. Continuous Subarrays](https://leetcode.com/problems/continuous-subarrays/) | Medium | Unsolved |
 | December 15 | [1792. Maximum Average Pass Ratio](https://leetcode.com/problems/maximum-average-pass-ratio/) | Medium | Unsolved |
 | December 16 | [3264. Final Array State After K Multiplication Operations I](https://leetcode.com/problems/final-array-state-after-k-multiplication-operations-i/) | Easy | Solved |
-| December 17 | []() |  |  |
+| December 17 | [2182. Construct String With Repeat Limit](https://leetcode.com/problems/construct-string-with-repeat-limit/) | Medium | Solved |
 | December 18 | []() |  |  |
 | December 19 | []() |  |  |
 | December 20 | []() |  |  |
@@ -39,5 +39,5 @@
 | Level  | Problems | Solved | Unsolved |
 | ---    | --- | --- | --- |
 | Easy   | 4 | 4 | 0 |
-| Medium | 12 | 7 | 5 |
+| Medium | 13 | 8 | 5 |
 | Hard   | 0 | 0 | 0 |