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OI-codes/AcWing/799/799.cpp

22 lines
386 B
C++

#include <iostream>
using std::cin;
using std::cout;
#define endl '\n'
int n, a[100005], s[100005], ans;
int main() {
cin >> n;
for (int i = 1; i <= n; i++) {
cin >> a[i];
}
for (int i = 1, j = 1; i <= n; i++) {
s[a[i]]++;
while (s[a[i]] > 1) s[a[j++]]--;
ans = std::max(ans, i - j + 1);
}
cout << ans << endl;
return 0;
}