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#include <iostream> #include <vector> #include <map> #define lli long long int #define li long int #define ld long double using namespace std; int main() { int n; cin >> n; vector<int> arr(n); for (int i = 0; i < n; i++) { cin >> arr[i]; } int i = 0, j = 0, max_len = 0, curr_len = 0; map<int, int> freq; while (j < n) { if (freq[arr[j]] == 0) { freq[arr[j]]++; curr_len++; max_len = max(max_len, curr_len); j++; } else { curr_len--; freq[arr[i]]--; i++; } } cout << max_len; return 0; }
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