Apr 11

Author: siddydutta

2025-04-April-LeetCoding-Challenge/Count Symmetric Integers.py

@@ -0,0 +1,37 @@
+class Solution:
+    def __is_symmetric(self, num: int) -> bool:
+        if num < 10:
+            return False
+        if num < 100:
+            d1 = num % 10
+            d2 = num // 10
+            return d1 == d2
+        if num < 1_000:
+            return False
+        if num < 10_000:
+            d1 = num % 10
+            num //= 10
+            d2 = num % 10
+            num //= 10
+            d3 = num % 10
+            num //= 10
+            d4 = num % 10
+            return d1 + d2 == d3 + d4
+        return False
+
+    def countSymmetricIntegers(self, low: int, high: int) -> int:
+        return sum(map(self.__is_symmetric, range(low, high+1)))
+
+
+def main():
+    low = 1
+    high = 100
+    assert Solution().countSymmetricIntegers(low, high) == 9
+
+    low = 1200
+    high = 1230
+    assert Solution().countSymmetricIntegers(low, high) == 4
+
+
+if __name__ == '__main__':
+    main()

2025-04-April-LeetCoding-Challenge/README.md

@@ -13,8 +13,8 @@
 | April 07 | [416. Partition Equal Subset Sum](https://leetcode.com/problems/partition-equal-subset-sum/) | Medium | Solved |
 | April 08 | [3396. Minimum Number of Operations to Make Elements in Array Distinct](https://leetcode.com/problems/minimum-number-of-operations-to-make-elements-in-array-distinct/) | Easy | Solved |
 | April 09 | [3375. Minimum Operations to Make Array Values Equal to K](https://leetcode.com/problems/minimum-operations-to-make-array-values-equal-to-k/) | Easy | Solved |
-| April 10 | []() |  |  |
-| April 11 | []() |  |  |
+| April 10 | [2999. Count the Number of Powerful Integers](https://leetcode.com/problems/count-the-number-of-powerful-integers/) | Hard | Unsolved |
+| April 11 | [2843. Count Symmetric Integers](https://leetcode.com/problems/count-symmetric-integers/) | Easy | Solved |
 | April 12 | []() |  |  |
 | April 13 | []() |  |  |
 | April 14 | []() |  |  |
@@ -39,6 +39,6 @@
 ## Summary
 | Level  | Problems | Solved | Unsolved |
 | ---    | --- | --- | --- |
-| Easy   | 3 | 3 | 0 |
+| Easy   | 4 | 4 | 0 |
 | Medium | 6 | 5 | 1 |
-| Hard   | 0 | 0 | 0 |
+| Hard   | 1 | 0 | 1 |