Create 1006-clumsy-factorial.js

Author: everthis

1006-clumsy-factorial.js

@@ -0,0 +1,33 @@
+/**
+ * @param {number} N
+ * @return {number}
+ */
+const clumsy = function(N) {
+  const ops = ["*", "/", "+", "-"];
+  const arr = [];
+  arr.push(N);
+  for (let i = N - 1, idx = 0; i > 0; i--, idx++) {
+    let op = ops[idx % 4];
+    let arrIdx = arr.length - 1 < 0 ? 0 : arr.length - 1;
+    switch (op) {
+      case "*":
+        arr[arrIdx] *= i;
+        break;
+      case "/":
+        arr[arrIdx] = Math.floor(arr[arrIdx] / i);
+        break;
+      case "+":
+        arr[0] += i;
+        break;
+      case "-":
+        arr.push(i);
+        break;
+    }
+  }
+
+  let res = arr[0];
+  for (let i = 1; i < arr.length; i++) {
+    res -= arr[i];
+  }
+  return res;
+};