Update 2218-maximum-value-of-k-coins-from-piles.js

Author: everthis

2218-maximum-value-of-k-coins-from-piles.js

@@ -19,3 +19,29 @@ var maxValueOfCoins = function(piles, k) {
     }
     return dp[k];    
 };
+
+// another
+
+/**
+ * @param {number[][]} piles
+ * @param {number} k
+ * @return {number}
+ */
+const maxValueOfCoins = function(piles, k) {
+  const n = piles.length
+  const memo = Array.from({ length: n + 1 }, () => Array(k + 1).fill(null))
+  return helper(0, k)
+
+  function helper(i, k) {
+    if(k == 0 || i === n) return 0
+    if(memo[i][k] != null) return memo[i][k]
+    let res = helper(i + 1, k)
+    let cur = 0
+
+    for(let j = 0; j < Math.min(piles[i].length, k); j++) {
+      cur += piles[i][j]
+      res = Math.max(res, cur + helper(i + 1, k - j - 1))
+    }
+    return memo[i][k] = res
+  }
+};