帮助Jimmy

//帮助Jimmy

#include<stdio.h>
#include<memory.h>
#include<stdlib.h>
#define MAX_N 1000
#define INFINITE 1000000
int t,n,x,y,max;
struct Platform{
	int Lx,Rx,h;
};
Platform aPlatform[MAX_N+10];
int aLeftMinTime[MAX_N+10];
int aRightMinTime[MAX_N+10];
int MyCompare(const void *e1,const void *e2)
{
	Platform *p1,*p2;
	p1=(Platform *)e1;
	p2=(Platform *)e2;
	return p2->h-p1->h;
}
int MinTime(int L,bool bLeft)
{
	int y=aPlatform[L].h;
	int x;
	if(bLeft)
		x=aPlatform[L].Lx;
	else
		x=aPlatform[L].Rx;
	int i;
	for(i=L+1;i<=n;i++){
		if(aPlatform[i].Lx<=x&&aPlatform[i].Rx>=x)
			break;
	}
	if(i<=n){
		if(y-aPlatform[i].h>max)
			return INFINITE;
	}else{
		if(y>max)
			return INFINITE;
		else
			return y;
	}
	int nLeftTime=y-aPlatform[i].h+x-aPlatform[i].Lx;
	int nRightTime=y-aPlatform[i].h+aPlatform[i].Rx-x;
	if(aLeftMinTime[i]==-1)
		aLeftMinTime[i]=MinTime(i,true);
	if(aRightMinTime[i]==-1)
		aRightMinTime[i]=MinTime(i,false);
	nLeftTime+=aLeftMinTime[i];
	nRightTime+=aRightMinTime[i];
	if(nLeftTime<nRightTime)
		return nLeftTime;
	return nRightTime;
}
int main()
{
	scanf("%d",&t);
	for(int i=0;i<t;i++){
		memset(aLeftMinTime,-1,sizeof(aLeftMinTime));
		memset(aRightMinTime,-1,sizeof(aRightMinTime));
		scanf("%d%d%d%d",&n,&x,&y,&max);
		aPlatform[0].Lx=x;
		aPlatform[0].Rx=x;
		aPlatform[0].h=y;
		for(int j=1;j<=n;j++)
			scanf("%d%d%d",&aPlatform[j].Lx,&aPlatform[j].Rx,&aPlatform[j].h);
		qsort(aPlatform,n+1,sizeof(Platform),MyCompare);
		printf("%d
",MinTime(0,true));
	}
	return 0;
}