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20 lines
452 B
C++
20 lines
452 B
C++
#include <cstdio>
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#include <cctype>
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inline void readInt(int& x)
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{
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x = 0;
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static int ch;
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while (!isdigit(ch = getchar()));
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while (isdigit(ch)) x = x * 10 + ch - '0', ch = getchar();
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}
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inline int _(int x) { return x < 0 ? 0 : x; }
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int main()
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{
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int n, cur, pre = 0, ans = 0;
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readInt(n);
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for (int i = 0; i < n; i++, pre = cur)
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readInt(cur), ans += _(cur - pre);
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printf("%d", ans);
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return 0;
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}
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