[LEET] 1690 Stone Game VII (Medium)

Author: 2YH02

이용훈/10주차/260306.js

@@ -0,0 +1,25 @@
+/**
+ * @param {number[]} stones
+ * @return {number}
+ */
+var stoneGameVII = function(stones) {
+    const n = stones.length;
+
+    const ps = Array(n + 1).fill(0);
+    for (let i = 0; i < n; i++) ps[i + 1] = ps[i] + stones[i];
+
+    const rangeSum = (l, r) => ps[r + 1] - ps[l];
+
+    const dy = Array.from({ length: n }, () => Array(n).fill(0));
+    for (let i = 2; i <= n; i++) {
+        for (let l = 0; l + i - 1 < n; l++) {
+            const r = l + i - 1;
+            const left = rangeSum(l + 1, r) - dy[l + 1][r];
+            const right = rangeSum(l, r - 1) - dy[l][r - 1];
+
+            dy[l][r] = Math.max(left, right);
+        }
+    }
+
+    return dy[0][n - 1];
+};