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void backtrack(int k,int count){
	hoanvi[0] = 0;
	if(k == soDiem+1){
		if(minn > count )
			minn=count;
		return;
	}
	if(minn < count) return;
	for(int i=1;i<=soDiem;i++){	
		if(vis[i]==0){
			vis[i]=1;
			hoanvi[k]=i;
			backtrack(k+1,count + data[hoanvi[k-1]][hoanvi[k]]);
			vis[i]=0;
		}
	}
}