one unfinished

CSES - CSES Problem Set/Playlist.cpp

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+//
+// Created by darian on 07.06.24.
+//
+
+#include <bits/stdc++.h>
+using namespace std;
+using ll = long long;
+
+int main() {
+    int n; cin >> n;
+    vector<ll> in(n);
+    for (auto &e : in) cin >> e;
+    int lo = 0;
+    int hi = 0;
+    int max_count = 1;
+    set<ll> current = {in[0]};
+
+    while (hi < n - 1) {
+        hi++;
+        while (current.count(in[hi])) {
+            current.erase(in[lo]);
+            lo++;
+        }
+        current.insert(in[hi]);
+        max_count = max(max_count, (int)current.size());
+    }
+    cout << max_count << endl;
+}