diff --git a/Arrays/TrappingRainwater.cpp b/Arrays/TrappingRainwater.cpp
new file mode 100644
index 0000000..3e37f16
--- /dev/null
+++ b/Arrays/TrappingRainwater.cpp
@@ -0,0 +1,28 @@
+class Solution {
+public:
+    int trap(vector<int>& height) {
+        int n = height.size();
+        int left = 0, right = n - 1;
+        int maxleft = 0, maxright = 0;
+        int res = 0;
+        
+        while(left <= right){
+            
+            if(height[left] <= height[right]){
+                if(height[left] >= maxleft) maxleft = height[left];
+                else
+                    res+= maxleft - height[left];
+                
+                left++;
+            }
+            else{
+                if(height[right] >= maxright) maxright = height[right];
+                else
+                    res+= maxright - height[right];
+                
+                right--;
+            }
+        }
+        return res;
+    }
+};
\ No newline at end of file