diff --git a/strings/minimum operation to convert one string to another string.md b/strings/minimum operation to convert one string to another string.md
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+### QUESTION
+
+    Given two strings s1,s2  , convert s1 to s2;
+    operations:
+    1. change any character from a to b  or b to a
+    2. any two characters can be swapped with cost |i-j|
+
+## Code in CPP
+```.cpp
+
+#include<bits/stdc++.h>
+using namespace std;
+int main(){
+    string s1,s2;
+    cin>>s1>>s2;
+
+    int cost=0;
+    for(int i=0;i<s1.length();i++)
+    {
+        if(s1[i]!=s2[i])
+        {
+
+            if(i<s1.length()-1 and s2[i+1]!=s1[i+1])
+            {
+                cost++;
+                swap(s1[i],s1[i+1]);
+                // swap(s2[i],s2[i+1]);
+            }
+            else 
+            {
+                cost++;
+                s1[i]=s2[i];
+            }
+        }
+        else continue;
+        
+    }
+
+    cout<<cost<<endl;
+}
+
+```