diff --git a/Coders/DSA Concepts/minSubstringWindow.cpp b/Coders/DSA Concepts/minSubstringWindow.cpp
new file mode 100644
index 0000000..920841e
--- /dev/null
+++ b/Coders/DSA Concepts/minSubstringWindow.cpp	
@@ -0,0 +1,33 @@
+class Solution {
+public:
+    string minWindow(string s, string t) {
+        string res = "";
+        if(s.size() < t.size()) return res;
+        unordered_map<char, int> umap;
+        for(auto it: t) umap[it]++;
+        int i=0, j=0;
+        int length = INT_MAX, count = umap.size();
+        while(j<s.size()){
+            if(umap.find(s[j])!=umap.end()){
+                umap[s[j]]--;
+                if(umap[s[j]]==0) count--;
+            }
+            if(count > 0) j++;
+            else if(count == 0){
+                while(count==0){
+                    if(umap.find(s[i])!=umap.end()){
+                        if(j-i+1 < length){
+                            length = j-i+1;
+                            res = s.substr(i, j-i+1);
+                        }
+                        umap[s[i]]++;
+                        if(umap[s[i]] > 0) count++;
+                    }
+                    i++;
+                }
+                j++;
+            }
+        }
+        return res;
+    }
+};