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22 lines
415 B
C++
22 lines
415 B
C++
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#include <bits/stdc++.h>
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using namespace std;
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long long n, a[100005];
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int main() {
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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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for (int i = n; i > 2; i--) {
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if (abs(a[i - 1] - a[i]) > abs(a[i - 1] + a[i])) {
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a[i - 1] -= a[i];
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} else {
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a[i - 1] += a[i];
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}
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}
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cout << max(a[1] - a[2], a[1] + a[2]) << endl;
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return 0;
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}
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