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23 lines
514 B
C++
23 lines
514 B
C++
#include <bits/stdc++.h>
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using namespace std;
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int main() {
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ios::sync_with_stdio(false);
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int n, pr = -1, cnt = 0;
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cin >> n;
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vector<int> v;
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for (int i = 0; i < n; i++) {
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int x;
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cin >> x;
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if (i == 0) pr = x;
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if (pr == x) cnt++;
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else v.push_back(cnt), cnt = 1, pr = x;
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}
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v.push_back(cnt);
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int ans = 0;
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for (int i = 1; i < v.size(); i++)
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ans = max(ans, min(v[i - 1], v[i]) * 2);
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cout << ans;
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return 0;
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} |