diff --git a/problem.CPP b/problem.CPP
new file mode 100644
index 0000000..55f1989
--- /dev/null
+++ b/problem.CPP
@@ -0,0 +1,26 @@
+class Solution {
+public:
+    int lengthOfLongestSubstring(string s) {
+        int ans = 0;
+        int n = s.size();
+        int temp = 0;
+        int h[128] = {0};
+        for(int i = 0;i<n;i++){
+            if(h[int(s[i])] > 0)
+            {
+                if(h[int(s[i])] >= 2)
+                for(int j = h[int(s[i])] - 2 ;j  >= (i - temp);j--){
+                    h[int(s[j])] = 0;
+                }
+                ans = max(ans,temp);
+                temp = i - h[int(s[i])]  + 1;
+                h[int(s[i])] = i + 1;
+            }
+            else{
+                temp++;
+                h[int(s[i])] = i + 1;
+            }
+        }
+        return max(ans,temp);
+    }
+};
diff --git a/trappingRainwater.py b/trappingRainwater.py
new file mode 100644
index 0000000..20086ea
--- /dev/null
+++ b/trappingRainwater.py
@@ -0,0 +1,21 @@
+class Solution(object):
+    def trap(self, height):
+        """
+        :type height: List[int]
+        :rtype: int
+        """
+        n=len(height)
+        left=[0]*n
+        right=[0]*n
+        maxi=-876543
+        for i in range(0,n):
+            left[i]=max(maxi,height[i])
+            maxi=left[i]
+        maxi=-876543
+        for i in range(n-1,-1,-1):
+            right[i]=max(maxi,height[i])
+            maxi=right[i]
+        ans=0
+        for i in range(0,n):
+            ans+=min(left[i],right[i])-height[i]
+        return ans