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我要疯了,我把我的程序改进了一下,都是NlogN了,怎么还是超时啊,哪位大哥帮我看看#include "stdio.h" #include "stdlib.h" #include "memory.h" int sum=0,flag,b[100000]; struct seg{ int x1; int y1; int x2; int y2; float x; float point; }; seg a[100001]; int compare(const void *arg1,const void *arg2) { if((*(seg *)arg1).x==(*(seg *)arg2).x) { if((*(seg *)arg1).point==(*(seg *)arg2).point) return (*(seg *)arg1).x1-(*(seg *)arg2).x1; else return (int )((*(seg *)arg1).point-(*(seg *)arg2).point); } else return (int)((*(seg *)arg1).x-(*(seg *)arg2).x); } int fd(int x,int n) { int l=0,r=n,mid=(r+l)/2; if(x>b[n]) return n+1; while(!(x>b[mid]&&x<=b[mid+1])) { if(x<b[mid]) { l=mid,mid=(l+r)/2; } else { r=mid,mid=(l+r)/2; } } return mid+1; } void main(void) { int t,n,i,j,temp,k,m,p; scanf("%d",&t); for(i=1;i<=t;i++) { scanf("%d",&n); for(j=0;j<n;j++) { scanf("%d%d%d%d",&a[j].x1,&a[j].y1,&a[j].x2,&a[j].y2); if(a[j].x1==a[j].x2) { a[j].x=1000001; a[j].point=(float)a[j].x1; if(a[j].y1<=a[j].y2) a[j].x1=a[j].y1,a[j].x2=a[j].y2; else a[j].x1=a[j].y2,a[j].x2=a[j].y1; } else { a[j].x=(float)(a[j].y2-a[j].y1)/(a[j].x2-a[j].x1); a[j].point=a[j].y1-a[j].x*a[j].x1; if(a[j].x1>a[j].x2) { temp=a[j].x1,a[j].x1=a[j].x2,a[j].x2=temp; } } } qsort(a,n,sizeof(seg),compare); for(j=0,sum=0;j<n-1;) { k=j+1; if(a[k].x==a[j].x&&a[k].point==a[j].point&&k<n) { int m=2; b[0]=a[j].x1,b[1]=a[j+1].x1,k++; while(a[k].x==a[j].x&&a[k].point==a[j].point&&k<n) b[m++]=a[k].x1,k++; for(p=0;p<m;p++) sum+=fd(a[j+p].x2,m-1); sum-=(1+m)*m/2; } j=k; } printf("Scenario #%d:\n%d\n\n",i,sum); } } Followed by:
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