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#include <bits/stdc++.h>
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using namespace std;
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typedef long long ll;
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int main()
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{
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int n, x, pre = 0, ans = 0;
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scanf("%d", &n);
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for (int i = 0; i < n; i++, pre = x)
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scanf("%d", &x), ans += max(0, x - pre);
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printf("%d", ans);
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return 0;
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} |
