June 2018 Update

Task/Permutation-test/Java/permutation-test.java

@@ -0,0 +1,30 @@
+public class PermutationTest {
+    private static final int[] data = new int[]{
+        85, 88, 75, 66, 25, 29, 83, 39, 97,
+        68, 41, 10, 49, 16, 65, 32, 92, 28, 98
+    };
+
+    private static int pick(int at, int remain, int accu, int treat) {
+        if (remain == 0) return (accu > treat) ? 1 : 0;
+        return pick(at - 1, remain - 1, accu + data[at - 1], treat)
+            + ((at > remain) ? pick(at - 1, remain, accu, treat) : 0);
+    }
+
+    public static void main(String[] args) {
+        int treat = 0;
+        double total = 1.0;
+        for (int i = 0; i <= 8; ++i) {
+            treat += data[i];
+        }
+        for (int i = 19; i >= 11; --i) {
+            total *= i;
+        }
+        for (int i = 9; i >= 1; --i) {
+            total /= i;
+        }
+        int gt = pick(19, 9, 0, treat);
+        int le = (int) (total - gt);
+        System.out.printf("<= : %f%%  %d\n", 100.0 * le / total, le);
+        System.out.printf(" > : %f%%  %d\n", 100.0 * gt / total, gt);
+    }
+}