delete pics to save space

5.1203A.cpp

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