C++ :

#include<stdio.h>
#include<string.h>
char fan(char a)
{
	if(a=='-')
		return '+';
	else if(a=='+')
		return '-';
}
int main()
{
//	freopen("in.txt","r",stdin);
//	freopen("out.txt","w",stdout);
	int n;
	scanf("%d",&n);
	while(n--)
	{
		int m;
		int num[1025];
		int i;
		char vfuhao,bfuhao='-';
		int count = 0;
		int visitedv = 0;
		scanf("%d",&m);
		for(i=0;i<m;i++)
		{
			scanf("%d",&num[i]);
			if(num[i]==1)
			{
				if(count<4)
				{
					int j;
					for(j=0;j<count;j++)
						printf("0");
				}
				count = 0;
				printf("%c1",bfuhao);
				bfuhao = fan(bfuhao);
				if(visitedv == 0)
				{
					vfuhao = fan(bfuhao);
				}
			}
			else
			{
				count ++;
				if(count==4)
				{
					if(vfuhao==fan(bfuhao))
					{
						printf("000%cV",vfuhao);
						vfuhao = fan(vfuhao);
					}
					else
					{
						printf("%cB00%cV",bfuhao,vfuhao);
						bfuhao = fan(bfuhao);
						vfuhao = fan(vfuhao);
					}
					count = 0;
					visitedv = 1;
				}
			}
		}
		printf("\n");
	}
	return 0;
}