Update Knapsack.java

Changed OR condition to &&, OR may possibly result in ArrayIndexOutOfBoundException , (as it does for following input capacity : 60, weights: [10, 20, 33], values: [10, 3, 30])

Author: aniders

src/com/jwetherell/algorithms/mathematics/Knapsack.java

@@ -40,7 +40,7 @@ public static final int[] zeroOneKnapsack(int[] values, int[] weights, int capac
         final List<Integer> list = new ArrayList<Integer>();
         int i = height - 1;
         int j = width - 1;
-        while (i != 0 || j != 0) {
+        while (i != 0 && j != 0) {
             int current = output[i][j];
             int above = output[i - 1][j];
             if (current == above) {