Create 12 June Count numbers containing 4 (#501)

Author: Chayandas07

12 June Count numbers containing 4

@@ -0,0 +1,14 @@
+class Solution {
+public:
+    void sortColors(vector<int>& nums) {
+        int r = 0, w = 0, b = nums.size() - 1;
+        while (w <= b){
+            if (!nums[w])
+                swap(nums[r++], nums[w++]);
+            else if (nums[w] == 1)
+                w++;
+            else
+                swap(nums[w], nums[b--]);
+        }
+    }
+};