Merge pull request #2821 from chetannada/ltc-1588-js

Create 1588-sum-of-all-odd-length-subarrays.js

Author: felivalencia3

Diff for: javascript/1588-sum-of-all-odd-length-subarrays.js

@@ -0,0 +1,12 @@
+/**
+ * @param {number[]} arr
+ * @return {number}
+ */
+var sumOddLengthSubarrays = function (arr) {
+    let sum = 0, len = arr.length;
+    for (let i = 0; i < arr.length; i++) {
+        let total = i * (len - i) + (len - i);
+        sum += Math.ceil(total / 2) * arr[i];
+    }
+    return sum;
+};