Create playlist.cpp

playlist.cpp

@@ -0,0 +1,31 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+int main() {
+    ios_base::sync_with_stdio(false);
+    cin.tie(NULL);
+    long long t;
+    cin>>t;
+    long long  arr[t];
+    long long  p=t;
+    while(t--){
+        cin>>arr[t];
+    }
+    long long count=1;
+    map<long long ,long long > s;
+    s[arr[0]]=0;
+    long long  i=0;
+    long long  j=1;
+    while(j<p){
+        if(s.find(arr[j])==s.end()){
+            s[arr[j]]=j;
+            j++;
+        }else{
+            if(s[arr[j]]>=i)i=s[arr[j]]+1;
+            s[arr[j]]=j;
+            j++;
+        }
+        count=max(count,j-i);
+    }cout<<count;
+    return 0;
+}