我服了，这都return 3221225477

#include<bits/stdc++.h>
using namespace std;
int t,n,a[51];
bool z,b;
int main() {
//	freopen(".in","r",stdin);
//	freopen(".out","w",stdout);
	scanf("%d",&t);
	for(int i=1;i<=t;i++){
		scanf("%d",&n);
		memset(a,0,sizeof(a));
		for(int j=1;j<=n;j++){
			scanf("%d",&a[i]);
		}
		z=b=0;
		for(int j=2;j<=n;j++){
			if(a[j]<a[j-1]){
				if(z){
					printf("No\n");
					b=1;
					break;
				}
				z=1;
			}
		}
		if(b==0){
			if(a[n]<=a[1]){
				printf("Yes\n");
			}
			else{
				if(z==0){
					printf("Yes\n");
				}
				else{
					printf("No\n");
				}
			}
		}
	}
	return 0;
}