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#include <bits/stdc++.h> using namespace std; int main() { int N; cin >> N; int a[N]; vector<int> v; for (int i = 0; i < N; i++) { cin >> a[i]; if (a[i] == 3) v.push_back(i + 1); } v.push_back(N + 1); int MAX = 0; for (int i = 0; i <= v.size() - 5; i++) MAX = max(MAX, v[i + 4] - v[i] - 1); cout << MAX; return 0; }
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