Apr 07

Author: siddydutta

2025-04-April-LeetCoding-Challenge/Partition Equal Subset Sum.py

@@ -0,0 +1,37 @@
+from functools import cache
+
+
+class Solution:
+    def canPartition(self, nums: list[int]) -> bool:
+        total = sum(nums)
+        if total & 1 != 0:
+            return False
+        else:
+            total = total // 2
+
+        @cache
+        def dfs(index: int, target: int) -> bool:
+            if target < 0:
+                return False
+            if target == 0:
+                return True
+
+            for i, num in enumerate(nums[index:], index):
+                if dfs(i+1, target-num):
+                    return True
+            return False
+
+        nums.sort(reverse=True)
+        return dfs(0, total)
+
+
+def main():
+    nums = [1, 5, 11, 5]
+    assert Solution().canPartition(nums) is True
+
+    nums = [1, 2, 3, 5]
+    assert Solution().canPartition(nums) is False
+
+
+if __name__ == '__main__':
+    main()

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

@@ -10,7 +10,7 @@
 | April 04 | [1123. Lowest Common Ancestor of Deepest Leaves](https://leetcode.com/problems/lowest-common-ancestor-of-deepest-leaves/) | Medium | Solved |
 | April 05 | [1863. Sum of All Subset XOR Totals](https://leetcode.com/problems/sum-of-all-subset-xor-totals/) | Easy | Solved |
 | April 06 | [368. Largest Divisible Subset](https://leetcode.com/problems/largest-divisible-subset/) | Medium | Unsolved |
-| April 07 | []() |  |  |
+| April 07 | [416. Partition Equal Subset Sum](https://leetcode.com/problems/partition-equal-subset-sum/) | Medium | Solved |
 | April 08 | []() |  |  |
 | April 09 | []() |  |  |
 | April 10 | []() |  |  |
@@ -40,5 +40,5 @@
 | Level  | Problems | Solved | Unsolved |
 | ---    | --- | --- | --- |
 | Easy   | 2 | 2 | 0 |
-| Medium | 4 | 3 | 1 |
+| Medium | 5 | 4 | 1 |
 | Hard   | 0 | 0 | 0 |