[정진영] 2026/10/01

leetcode3/정진영/1219. Path with Maximum Gold

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+/**
+ * @param {number[][]} grid
+ * @return {number}
+ */
+var getMaximumGold = function(grid) {
+    let ans = 0;
+    let m = grid.length;
+    let n = grid[0].length;
+
+    function dfs(i, j) {
+        if (i < 0 || i >= m || j < 0 || j >= n || grid[i][j] === 0) {
+            return 0;
+        }
+
+        let gold = grid[i][j];
+
+        grid[i][j] = 0;
+
+        // 상하좌우 중 가장 많은 금을 얻는 경로
+        let up = dfs(i - 1, j);
+        let down = dfs(i + 1, j);
+        let left = dfs(i, j - 1);
+        let right = dfs(i, j + 1);
+
+        // 다시 원래대로 돌려놓기
+        grid[i][j] = gold;
+
+        return gold + Math.max(up, down, left, right);
+    }
+
+    // 모든 칸을 시작점으로 해보기
+    for (let i = 0; i < m; i++) {
+        for (let j = 0; j < n; j++) {
+            if (grid[i][j] !== 0) {
+                ans = Math.max(ans, dfs(i, j));
+            }
+        }
+    }
+
+    return ans;
+};

leetcode3/정진영/543. Diameter of Binary Tree

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+/**
+ * Definition for a binary tree node.
+ * function TreeNode(val, left, right) {
+ *     this.val = (val===undefined ? 0 : val)
+ *     this.left = (left===undefined ? null : left)
+ *     this.right = (right===undefined ? null : right)
+ * }
+ */
+/**
+ * @param {TreeNode} root
+ * @return {number}
+ */
+var diameterOfBinaryTree = function(root) {
+    let count = 0;
+
+    function dfs(node){
+        if (node == null) return 0;
+
+        let left = dfs(node.left);
+        let right = dfs(node.right);
+
+        count = Math.max(count, left+right);
+
+        return Math.max(left, right) + 1;
+    }
+
+    dfs(root);
+
+    return count;
+};