【模板整合计划】计算几何

【模板整合计划】计算几何

一:【计算几何全家桶】

二:【自适应辛普森积分】

1.【自适应辛普森积分 1】

【模板】自适应辛普森法 \(1\) \(\text{[P4525]}\)

(局部精度)

#include<algorithm>
#include<cstdio>
#include<cmath>
#define LD double
#define LL long long
#define Re register int
#define Vector Point
using namespace std;
const LD eps=1e-7;
inline int dcmp(LD a,LD eps){return a<-eps?-1:(a>eps?1:0);}
LD a,b,c,d,L,R;
inline LD F(LD x){return (c*x+d)/(a*x+b);}
inline LD Simpson(LD L,LD R){return (R-L)*(F(L)+4.0*F((L+R)*0.5)+F(R))/6.0;}
inline LD sakura(LD L,LD R,LD now,LD eps){
    LD mid=(L+R)*0.5,FL=Simpson(L,mid),FR=Simpson(mid,R);
    if(!dcmp(now-FL-FR,eps))return now;
    return sakura(L,mid,FL,eps/2)+sakura(mid,R,FR,eps/2);
}
int main(){
//    freopen("123.txt","r",stdin);
    scanf("%lf%lf%lf%lf%lf%lf",&a,&b,&c,&d,&L,&R);
    printf("%lf\n",sakura(L,R,Simpson(L,R),eps));
}

(全局精度)

#include<algorithm>
#include<cstdio>
#include<cmath>
#define LD double
#define LL long long
#define Re register int
#define Vector Point
using namespace std;
const LD eps=1e-13;
inline int dcmp(LD a){return a<-eps?-1:(a>eps?1:0);}
LD a,b,c,d,L,R;
inline LD F(LD x){return (c*x+d)/(a*x+b);}
inline LD Simpson(LD L,LD R){return (R-L)*(F(L)+4.0*F((L+R)*0.5)+F(R))/6.0;}
inline LD sakura(LD L,LD R,LD now){
    LD mid=(L+R)*0.5,FL=Simpson(L,mid),FR=Simpson(mid,R);
    if(!dcmp(now-FL-FR))return now;
    return sakura(L,mid,FL)+sakura(mid,R,FR);
}
int main(){
//    freopen("123.txt","r",stdin);
    scanf("%lf%lf%lf%lf%lf%lf",&a,&b,&c,&d,&L,&R);
    printf("%lf\n",sakura(L,R,Simpson(L,R)));
}

2.【自适应辛普森积分 2】

【模板】自适应辛普森法 \(2\) \(\text{[P4526]}\)

还没学,先咕着。

posted @ 2020-05-24 20:35  辰星凌  阅读(703)  评论(0编辑  收藏  举报