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17 lines
352 B
C++
17 lines
352 B
C++
#include <cstdio>
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#include <set>
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#include <vector>
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using namespace std;
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const int N = 2e5 + 20;
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int a[N];
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int main()
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{
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int n,ans=0;
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scanf("%d", &n);
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for (int i = 1; i <= n; i++)
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scanf("%d", a + i);
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for (int i = 1; i <= n; i++)
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if (a[i - 1] == 1 && a[i] == 0 && a[i + 1] == 1)a[i + 1] = 0, ans++;
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printf("%d", ans);
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return 0;
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} |