adding leetcode problems

leetcode/p27_removeelement.cpp

@@ -0,0 +1,17 @@
+// note: using template here is completely unnecessary. this is just a demonstration of how to define a templated function.
+
+class Solution {
+public:
+    template <typename T>
+    T removeElement(vector<T>& nums, T val) {
+        int size = nums.size();
+        int j = 0;
+        for(int i=0;i<size;i++){
+            if(nums[i] != val){
+                nums[j] = nums[i];
+                j++;
+            }
+        }
+        return j;
+    }
+};