Create 2965-find-missing-and-repeated-values.js

javascript/2965-find-missing-and-repeated-values.js

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+/**
+ * Brute Force | Hash Set
+ * Time O(n^2) | Space O(n^2)
+ * https://leetcode.com/problems/find-missing-and-repeated-values
+ * @param {number[][]} grid
+ * @return {number[]}
+ */
+var findMissingAndRepeatedValues = function(grid) {
+
+    const n = grid.length;
+    const haves = new Set();
+    const visited = new Set();
+    let doubleCount = -1;
+
+    for (let i = 0; i < n; i++) {
+        for (let j = 0; j < n; j++) {
+            haves.add(grid[i][j]);
+            if (visited.has(grid[i][j])) {
+                doubleCount = grid[i][j];
+            }
+            visited.add(grid[i][j]);
+        }
+    }
+
+    let missing = -1;
+
+    for (let i = 0; i < n**2; i++) {
+        if (!haves.has(i+1)) {
+            missing = i+1;
+        }
+    }
+
+    return [doubleCount, missing];
+};