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23 lines
545 B
C++
23 lines
545 B
C++
#include <cstdio>
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#include <algorithm>
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using namespace std;
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int n,p[1005];
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int main()
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{
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scanf("%d",&n);
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for(int i=0; i<n; i++)
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scanf("%d",p+i);
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for(int i = 0; i < n-1; i++)
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for(int j = i+1; j < n-1; j++)
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{
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int a = min(p[i],p[i+1]);
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int b = max(p[i],p[i+1]);
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int c = min(p[j],p[j+1]);
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int d = max(p[j],p[j+1]);
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if((c>a&&c<b&&d>b)||(d>a&&d<b&&c<a))
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return puts("yes"),0;
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}
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puts("no");
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return 0;
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}
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