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42 lines
816 B
C++
42 lines
816 B
C++
#include <iostream>
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#include <algorithm>
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#include <cstring>
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using std::cin;
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using std::cout;
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const char endl = '\n';
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const int N = 3e5 + 5;
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int n;
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long long a[N], f[N][2], g[N][2];
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int main() {
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std::ios::sync_with_stdio(false);
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cin >> n;
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for (int i = 1; i <= n; i++) {
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cin >> a[i];
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}
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memset(f, 0x3f, sizeof(f));
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memset(g, 0x3f, sizeof(g));
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f[1][1] = a[1];
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for (int i = 2; i <= n; i++) {
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f[i][0] = f[i - 1][1];
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f[i][1] = std::min({f[i][1], f[i - 1][0] + a[i], f[i - 1][1] + a[i]});
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}
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g[1][0] = a[n];
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for (int i = 2; i < n; i++) {
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g[i][0] = g[i - 1][1];
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g[i][1] = std::min({g[i][1], g[i - 1][0] + a[i], g[i - 1][1] + a[i]});
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}
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cout << std::min({f[n][0], f[n][1], g[n - 1][0], g[n - 1][1]}) << endl;
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return 0;
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}
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