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#include <iostream> #include <vector> #include <cstring> #include <algorithm> #include <fstream> #include <map> #include <stack> using namespace std; typedef long long ll; const int INF = 1e9; int main() { ios_base::sync_with_stdio(false); // ifstream cin("in.txt"); int n; cin >> n; vector<int> v(n); for(int i = 0; i < n; i++) { cin >> v[i]; } map<int, int> cnt; int L = 0, R = 0; int current_length = 0; int ans = 0; while(R < n) { if(cnt.find(v[R]) == cnt.end() or cnt[v[R]] == 0) { cnt[v[R]] += 1; current_length += 1; ans = max(ans, current_length); R += 1; } else { current_length -= 1; cnt[v[L]] -= 1; L += 1; } } cout << ans << endl; return 0; } /* mapa<int, int> m; 1 2 1 3 2 i7 4 2j */
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