Merge pull request #9119 from Firedrake/rogerbw-challenge-244

RogerBW solutions for challenge no. 244

1 files changed, 52 insertions, 0 deletions

diff --git a/challenge-244/roger-bell-west/javascript/ch-2.js b/challenge-244/roger-bell-west/javascript/ch-2.js
new file mode 100755
index 0000000000..f0599b7a7e
--- /dev/null
+++ b/challenge-244/roger-bell-west/javascript/ch-2.js
@@ -0,0 +1,52 @@
+#! /usr/bin/node
+
+"use strict"
+
+function combinations(arr, k) {
+    let c = [];
+    for (let i = 0; i < k; i++) {
+        c.push(i);
+    }
+    c.push(arr.length);
+    c.push(0);
+    let out = [];
+    while (true) {
+        let inner = [];
+        for (let i = k-1; i >= 0; i--) {
+            inner.push(arr[c[i]]);
+        }
+        out.push(inner);
+        let j = 0;
+        while (c[j] + 1 == c[j + 1]) {
+            c[j] = j;
+            j += 1;
+        }
+        if (j >= k) {
+            break;
+        }
+        c[j] += 1;
+    }
+    return out;
+}
+
+function grouphero(nums0) {
+    let nums = [...nums0];
+    nums.sort(function(a,b) {
+        return b-a;
+    });
+    let sum = 0;
+    for (let l = 1; l <= nums.length; l++) {
+        for (let c of combinations(nums, l)) {
+            const h = c[c.length - 1];
+            sum += h * h * c[0];
+        }
+    }
+    return sum;
+}
+
+if (grouphero([2, 1, 4]) == 141) {
+  process.stdout.write("Pass");
+} else {
+  process.stdout.write("FAIL");
+}
+process.stdout.write("\n");