Mar 28

Author: siddydutta

2025-03-March-LeetCoding-Challenge/Maximum Number of Points From Grid Queries.py

@@ -0,0 +1,43 @@
+from heapq import heappop, heappush
+
+
+class Solution:
+    DIRECTIONS = ((-1, 0), (1, 0), (0, -1), (0, 1))
+
+    def maxPoints(self, grid: list[list[int]], queries: list[int]) -> list[int]:
+        queries = [(query, idx) for idx, query in enumerate(queries)]
+        queries.sort()
+        rows, cols = len(grid), len(grid[0])
+        result = [0] * len(queries)
+        visited = [[False] * cols for _ in range(rows)]
+        heap = [(grid[0][0], 0, 0)]
+        visited[0][0] = True
+        points = 0
+        for query, idx in queries:
+            while heap and heap[0][0] < query:
+                _, x, y = heappop(heap)
+                points += 1
+                for dx, dy in self.DIRECTIONS:
+                    nx, ny = x + dx, y + dy
+                    if 0 <= nx < rows and 0 <= ny < cols and not visited[nx][ny]:
+                        heappush(heap, (grid[nx][ny], nx, ny))
+                        visited[nx][ny] = True
+            result[idx] = points
+        return result
+
+
+def main():
+    grid = [[1, 2, 3],
+            [2, 5, 7],
+            [3, 5, 1]]
+    queries = [5, 6, 2]
+    assert Solution().maxPoints(grid, queries) == [5, 8, 1]
+
+    grid = [[5, 2, 1],
+            [1, 1, 2]]
+    queries = [3]
+    assert Solution().maxPoints(grid, queries) == [0]
+
+
+if __name__ == '__main__':
+    main()

2025-03-March-LeetCoding-Challenge/README.md

@@ -31,7 +31,7 @@
 | March 25 | [3394. Check if Grid can be Cut into Sections](https://leetcode.com/problems/check-if-grid-can-be-cut-into-sections/) | Medium | Solved |
 | March 26 | [2033. Minimum Operations to Make a Uni-Value Grid](https://leetcode.com/problems/minimum-operations-to-make-a-uni-value-grid/) | Medium | Solved |
 | March 27 | [2780. Minimum Index of a Valid Split](https://leetcode.com/problems/minimum-index-of-a-valid-split/) | Medium | Unsolved |
-| March 28 | []() |  |  |
+| March 28 | [2503. Maximum Number of Points From Grid Queries](https://leetcode.com/problems/maximum-number-of-points-from-grid-queries/) | Hard | Unsolved |
 | March 29 | []() |  |  |
 | March 30 | []() |  |  |
 | March 31 | []() |  |  |
@@ -42,4 +42,4 @@
 | ---    | --- | --- | --- |
 | Easy   | 6 | 6 | 0 |
 | Medium | 20 | 9 | 11 |
-| Hard   | 1 | 0 | 1 |
+| Hard   | 2 | 0 | 2 |