luogu2293 [JSOI2008]Blue Mary开公司

ref好像叫什么李超线段树？……这篇不是太通用……

#include <iostream>
#include <cstdio>
#include <cmath>
using namespace std;
int n, T, uu;
double sa, sb;
const double eps=1e-7;
char ss[15];
struct SGT{
	double tagk[200005], tagx[200005];
	void update(int o, int l, int r, double k, double x){
		if(tagk[o]*l+tagx[o]<k*l+x && tagk[o]*r+tagx[o]<k*r+x){
			tagk[o] = k;
			tagx[o] = x;
		}
		else if(tagk[o]*l+tagx[o]<k*l+x || tagk[o]*r+tagx[o]<k*r+x){
			int mid=(l+r)>>1;
			int lson=o<<1;
			int rson=lson|1;
			update(lson, l, mid, k, x);
			update(rson, mid+1, r, k, x);
		}
	}
	double query(int o, int l, int r, int x){
		double re=x*tagk[o]+tagx[o];
		if(l==r)	return re;
		else{
			int mid=(l+r)>>1;
			int lson=o<<1;
			int rson=lson|1;
			if(x<=mid)	return max(re, query(lson, l, mid, x));
			else	return max(re, query(rson, mid+1, r, x));
		}
	}
}sgt;
int main(){
	cin>>n;
	while(n--){
		scanf("%s", ss);
		if(ss[0]=='P'){
			scanf("%lf %lf", &sa, &sb);
			sgt.update(1, 1, 50000, sb, sa-sb);
		}
		else{
			scanf("%d", &uu);
			printf("%d
", (int)floor(sgt.query(1, 1, 50000, uu)/100));
		}
	}
	return 0;
}