Change project structure to a Maven Java project + Refactor (#2816)

src/main/java/com/thealgorithms/dynamicprogramming/Knapsack.java

@@ -0,0 +1,38 @@
+package com.thealgorithms.dynamicprogramming;
+
+/**
+ * A DynamicProgramming based solution for 0-1 Knapsack problem
+ */
+public class Knapsack {
+
+    private static int knapSack(int W, int wt[], int val[], int n) throws IllegalArgumentException {
+        if (wt == null || val == null) {
+            throw new IllegalArgumentException();
+        }
+        int i, w;
+        int rv[][] = new int[n + 1][W + 1]; // rv means return value
+
+        // Build table rv[][] in bottom up manner
+        for (i = 0; i <= n; i++) {
+            for (w = 0; w <= W; w++) {
+                if (i == 0 || w == 0) {
+                    rv[i][w] = 0;
+                } else if (wt[i - 1] <= w) {
+                    rv[i][w] = Math.max(val[i - 1] + rv[i - 1][w - wt[i - 1]], rv[i - 1][w]);
+                } else {
+                    rv[i][w] = rv[i - 1][w];
+                }
+            }
+        }
+
+        return rv[n][W];
+    }
+
+    // Driver program to test above function
+    public static void main(String args[]) {
+        int val[] = new int[]{50, 100, 130};
+        int wt[] = new int[]{10, 20, 40};
+        int W = 50;
+        System.out.println(knapSack(W, wt, val, val.length));
+    }
+}