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35 lines
685 B
35 lines
685 B
#include <bits/stdc++.h>
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using namespace std;
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const int N = 500010;
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int f[N][2];
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int a[N];
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int main() {
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freopen("5.in", "r", stdin);
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int n;
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cin >> n;
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for (int i = 1; i <= n; i++) cin >> a[i];
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/*
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8
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1 2 8 3 3 4 4 5
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10
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8 1 1 2 3 4 5 6 7 8
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10
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3 2 2 5 5 6 2 2 1 1
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*/
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// 1、处理f[i][1]
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for (int i = 1; i <= n; i++) {
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if (a[i] == a[i - 1]) f[i][1] = a[i] + 1;
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if (a[i] == f[i - 1][1]) f[i][1] = a[i] + 1;
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}
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// 2、处理f[i][0]
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for (int i = 1; i <= n; i++) f[i][0] = max({a[i], f[i - 1][0], f[i - 1][1]});
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cout << max(f[n][0], f[n][1]) << endl;
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return 0;
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} |