Create 2938-separate-black-and-white-balls.js

Author: everthis

2938-separate-black-and-white-balls.js

@@ -0,0 +1,18 @@
+/**
+ * @param {string} s
+ * @return {number}
+ */
+var minimumSteps = function(s) {
+  let n = s.length
+  let left = n - 1
+  let right = n - 1
+  let cnt = 0
+  while (left >= 0) {
+    if (s.charAt(left) === '1') {
+      cnt += right - left
+      right--
+    }
+    left--
+  }
+  return cnt
+};