[LEET] 1582 Special Positions in a Binary Matrix (Easy)

Author: 2YH02

이용훈/10주차/260304.js

@@ -0,0 +1,31 @@
+/**
+ * @param {number[][]} mat
+ * @return {number}
+ */
+var numSpecial = function(mat) {
+    const m = mat.length;
+    const n = mat[0].length;
+
+    const row = Array(m).fill(0);
+    const col = Array(n).fill(0);
+
+    for (let i = 0; i < m; i++) {
+        for (let j = 0; j < n; j++) {
+            if (mat[i][j] === 1) {
+                row[i]++;
+                col[j]++;
+            }
+        }
+    }
+
+    let answer = 0;
+    for (let i = 0; i < m; i++) {
+        if (row[i] !== 1) continue;
+
+        for (let j = 0; j < n; j++) {
+            if (mat[i][j] === 1 && col[j] === 1) answer++;
+        }
+    }
+
+  return answer;
+};