Added 1520A - Do Not Be Distracted!.cpp

Author: vikashpatel24

1520A - Do Not Be Distracted!.cpp

@@ -0,0 +1,47 @@
+//                                 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
+
+
+bool checkV(vector<char> t, char ch) 
+{
+    for(auto i : t)
+    {
+        if(i==ch)
+        return 1;
+    }
+    return 0;
+}
+
+int main()
+{
+    int t;
+    cin>>t;
+    while(t--)
+    {
+        int n;
+        string s;
+        cin>>n>>s;
+        vector<char> temp;
+        int ans = 1;
+        for(int i=0;i<n;i++)
+        {
+            if(checkV(temp, s[i]))
+            {
+                ans = 0;
+                break;
+            }
+            if(s[i]!=s[i+1])
+            temp.push_back(s[i]);
+        }
+        if(ans)
+        cout<<"YES"<<endl;
+        else
+        cout<<"NO"<<endl;
+    }
+    return 0;
+}