玄关球跳

void updata(int u,int L,int R,double  y){
	if(inrange(L,R,tree[u].left,tree[u].right)){
		maketag(u,y);
	}else if(!nrange(L,R,tree[u].left,tree[u].right)){
		pushdown(u);
		updata(u*2,L,R,y);updata(u*2+1,L,R,y);
		tree[u].sum=tree[u*2].sum+tree[u*2+1].sum;
		tree[u].squaresum=tree[u*2].squaresum+tree[u*2+1].squaresum;
	}return ;
}