diff --git a/OOPS/tappingrainwater.cpp b/OOPS/tappingrainwater.cpp
new file mode 100644
index 0000000..539eac8
--- /dev/null
+++ b/OOPS/tappingrainwater.cpp
@@ -0,0 +1,29 @@
+class Solution {
+public:
+    int trap(vector<int>& height) {
+        int lMax = 0;
+        int rMax = 0;
+        int total = 0;
+        int left = 0;
+        int right = height.size()-1;
+        while(left < right){
+            if(height[left] <= height[right]){
+                if(lMax > height[left]){
+                    total += lMax-height[left];
+                }else{
+                    lMax = height[left];
+                }
+                left = left+1;
+            }
+            else{
+                if(rMax > height[right]){
+                    total += rMax - height[right];
+                }else{
+                    rMax = height[right];
+                }
+            right = right - 1;
+            }
+        }
+        return total;
+    }
+};