Time: 164 ms (32.42%), Space: 16.7 MB (33.33%) - LeetHub

1704-special-positions-in-a-binary-matrix/1704-special-positions-in-a-binary-matrix.py

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+class Solution:
+    def numSpecial(self, mat: List[List[int]]) -> int:
+        ans = 0
+        m = len(mat)
+        n = len(mat[0])
+
+        for row in range(m):
+            for col in range(n):
+                if mat[row][col] == 0:
+                    continue
+
+                good = True
+                for r in range(m):
+                    if r != row and mat[r][col] == 1:
+                        good = False
+                        break
+
+                for c in range(n):
+                    if c != col and mat[row][c] == 1:
+                        good = False
+                        break
+
+                if good:
+                    ans += 1
+
+        return ans