警示后人

inline void build(int u,int l,int r){
	l(u) = l,r(u) = r,tag1(u) = -inf,tag2(u) = inf,tag5(u) = 0;
	if (l == r){
		w(u) = max1(u) = min1(u) = a[l],max2(u) = -inf,min2(u) = inf,cntmax(u) = cntmin(u) = 1;
		return;
	}
	int mid = (l + r) >> 1;
	build(u << 1,l,mid);
	build((u << 1) | 1,mid + 1,r);
	pushup(u);
}

inline void build(int u,int l,int r){
	l(u) = l,r(u) = r;
	if (l == r){
		w(u) = max1(u) = min1(u) = a[l],max2(u) = -inf,min2(u) = inf,cntmax(u) = cntmin(u) = 1;
        tag1(u) = -inf,tag2(u) = inf,tag5(u) = 0;
		return;
	}
	int mid = (l + r) >> 1;
	build(u << 1,l,mid);
	build((u << 1) | 1,mid + 1,r);
	pushup(u);
}