Added 1791C - Prepend and Append.cpp

Author: vikashpatel24

1791C - Prepend and Append.cpp

@@ -0,0 +1,31 @@
+//                                 ॐ नमः शिवाय
+#include<bits/stdc++.h>
+using namespace std;
+#define ll long long
+ 
+// Code Written By: Vikash Patel
+// Codeforces Profile: https://codeforces.com/profile/vikashpatel
+ 
+int main()
+{
+    int t;
+    cin>>t;
+    while(t--)
+    {
+        int n;
+        cin>>n;
+        string s;
+        cin>>s;
+        int c = 0;
+        int j = n-1;
+        for(int i=0; i<n/2; i++)
+        {
+            if(s[i]==s[j-i])
+            break;
+            if(s[i]!=s[j-i])
+            c += 2;
+        }
+        cout<<n-c<<endl;
+    }
+    return 0;
+}