30 lines
450 B
C++
30 lines
450 B
C++
#include<cstdio>
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#include<cstring>
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#include<algorithm>
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using namespace std;
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int Q,n,a[205];
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int check(int d)
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{
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int p=0;
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for(int i=0;i<n;i++)
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{
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int t=a[i]-a[(i+d+n)%n];
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if(t!=1&&t!=1-n) return 0;
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}
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return 1;
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}
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int main()
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{
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#ifdef local
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freopen("pro.in","r",stdin);
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#endif
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scanf("%d",&Q);
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while(Q-->0)
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{
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scanf("%d",&n);
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for(int i=0;i<n;i++) scanf("%d",&a[i]);
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if(check(1)||check(-1)) puts("YES");
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else puts("NO");
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}
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return 0;
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} |