Added 1714B - Remove Prefix.cpp

Author: vikashpatel24

1714B - Remove Prefix.cpp

@@ -0,0 +1,49 @@
+//                                 ॐ नमः शिवाय
+#include<bits/stdc++.h>
+using namespace std;
+
+#define ll long long
+#define pb push_back
+#define ff first
+#define ss second
+#define mp make_pair
+ 
+// Code Written By: Vikash Patel
+// Codeforces Profile: https://codeforces.com/profile/vikashpatel
+
+int main()
+{
+    ios_base::sync_with_stdio(0);
+    cin.tie(0);
+    cout.tie(0);
+    
+    // #ifndef ONLINE_JUDGE
+    // freopen("input.txt", "r", stdin);
+    // freopen("/Users/vikash/Desktop/output.txt", "w", stdout);
+    // #endif
+    
+    int t;
+    cin>>t;
+    while(t--)
+    {
+        int n;
+        cin>>n;
+        int a[n], b[n+1]={0};
+        for(int i=0; i<n; i++)
+        {
+            cin>>a[i];
+            b[a[i]]++;
+        }
+        int ans = 0;
+        for(int i=0; i<n; i++)
+        {
+            if(b[a[i]]>1)
+            {
+                b[a[i]]--;
+                ans = i+1;
+            }
+        }
+        cout<<ans<<endl;
+    }
+    return 0;
+}