[JSOI2008]Blue Mary开公司[李超线段树]

佚名 6年前 (2019-04-09) 随笔 1590人围观抢沙发百度已收录

题面

好久以前听lxl讲过咕掉了。。竟然又遇到了
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#include <cmath>
#include <cstring>
#include <cstdio>
#include <cstdlib>
#include <algorithm>
#include <complex>
#include <ctime>
#include <vector>
#define mp(x, y) make_pair(x, y)
using namespace std;
const int N = 1e5 + 5;
const int n = 5e4 + 2;
const double eps = 1e-9;
struct Line{
    double k, b;
    double f(double x){return k * x + b;}
}line[N];
int lsize;
struct LCSeg{
    int w[N << 2];
    void ins(int rt, int l, int r, int id){
        if(!w[rt]){w[rt] = id; return ;}
        if(l == r){
            if(line[id].f(l) > line[w[rt]].f(l)) w[rt] = id; 
            return ;
        }
        int mid = l + ((r - l) >> 1);
        if(line[id].k > line[w[rt]].k){
            if(line[id].f(mid) > line[w[rt]].f(mid)) ins(rt << 1, l, mid, w[rt]), w[rt] = id;
            else ins(rt << 1 | 1, mid + 1, r, id);
        }
        else {
            if(line[id].f(mid) > line[w[rt]].f(mid)) ins(rt << 1 | 1, mid + 1, r, w[rt]), w[rt] = id;
            else ins(rt << 1, l, mid, id);
        }//这边要好好推 
    }
    double qry(int rt, int l, int r, int x){
        if(l == r) return line[w[rt]].f(x);
        double res = line[w[rt]].f(x);
        int mid = l + ((r - l) >> 1);
        if(x <= mid) res = max(res, qry(rt << 1, l, mid, x));
        else res = max(res, qry(rt << 1 | 1, mid + 1, r, x));
        return res;
    }
}seg;
int main(){
    int T, pos; double x, y; char ss[N];
    scanf("%d", &T); 
    while(T--){
        scanf("%s", ss);
        if(ss[0] == 'Q'){
            scanf("%d", &pos);
            double res = seg.qry(1, 1, n, pos);
            printf("%d\n", (int)res / 100);
        }
        else {
            ++lsize;
            scanf("%lf%lf", &line[lsize].b, &line[lsize].k); line[lsize].b -= line[lsize].k;
            seg.ins(1, 1, n, lsize);
        }
    } 
    return 0;   
}