Create special-positions-in-a-binary-matrix.cpp

Author: kamyu104

C++/special-positions-in-a-binary-matrix.cpp

@@ -0,0 +1,25 @@
+// Time:  O(n^2)
+// Space: O(n)
+
+class Solution {
+public:
+    int numSpecial(vector<vector<int>>& mat) {
+        vector<int> rows(size(mat)), cols(size(mat[0]));
+        for (int i = 0; i < size(rows); ++i) {
+            for (int j = 0; j < size(cols); ++j) {
+                if (mat[i][j]) {
+                    ++rows[i], ++cols[j];
+                }
+            }
+        }
+        int result = 0;
+        for (int i = 0; i < size(rows); ++i) {
+            for (int j = 0; j < size(cols); ++j) {
+                if (mat[i][j] && rows[i] == 1 && cols[j] == 1) {
+                    ++result;
+                }
+            }
+        }
+        return result;
+    }
+};