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两行的东西都写成函数?调用起来浪费多少时间(pascal的习惯真是……)In Reply To:Re:用prim,比并查集快. Posted by:springtty at 2005-07-14 12:58:35 > 用了prim的,在build函数中处理,但是还是超时,本地处理700个数据花了3s,大部分时间像是在处理输入输出
> #include <iostream>
> #include <string.h>
> using namespace std;
> #define GetDisDB(x0,y0,x1,y1) ((x1-x0)*(x1-x0)+(y1-y0)*(y1-y0))
> #define Max 751
> typedef struct
> {
> int x,y;
> }Point;
>
> int HashConn[Max][Max];
> int Map[Max][Max];
> int SetConn[Max];
> int ConnEndIndex;
> int SetLeft[Max];
> int LeftEndIndex;
>
> Point Value[Max];
>
> void SetZero(int a,int b)
> {
> Map[a][b] = 0;
> Map[b][a] = 0;
> }
>
> void RemoveIndexFromLeft(int index)
> {
> SetLeft[index] = 0;
> LeftEndIndex--;
> }
>
> void AddIndexToSetConn(int v)
> {
> ConnEndIndex++;
> SetConn[ConnEndIndex] = v;
> }
>
> void Build(int n)
> {
> int a,b,i,j,v;
> int index = 0;
> int curi,curj;
>
> while(LeftEndIndex)
> {
> a = b = 0;
> v = 0x0FFFFFFF;
>
> for(i= 1;i<=ConnEndIndex;i++)
> for(j=1;j<=n;j++)
> {
> if(SetLeft[j])
> {
> curi = SetConn[i];
> curj = SetLeft[j];
>
> if((Map[curi][curj]<v))
> {
> a = curi;
> b = curj;
> v = Map[curi][curj];
> index = j;
> }
> }
>
> }
> if(!HashConn[a][b]) cout<<a<<" "<<b<<endl;
> AddIndexToSetConn(b);
> RemoveIndexFromLeft(index);
>
> }
> }
>
>
> int main()
> {
> int i,j,n,p,a,b;
> int v,x,y;
>
> (cin>>n);
> {
> memset(Map,0,sizeof(int)*Max*Max);
> memset(SetConn,0,Max*sizeof(int));
> memset(SetLeft,0,Max*sizeof(int));
> memset(Value,0,Max*sizeof(Point));
> memset(HashConn,0,sizeof(int)*Max*Max);
>
> for(i=1;i<=n;i++)
> {
> cin>>x>>y;
> Value[i].x = x;
> Value[i].y = y;
> SetLeft[i] = i;
> }
>
> for(i=1;i<=n;i++)
> for(j=i+1;j<=n;j++)
> {
> Map[i][j] = GetDisDB(Value[i].x,Value[i].y,Value[j].x,Value[j].y);
> Map[j][i] = Map[i][j];
> }
>
>
> cin>>p;
>
> for(i=1;i<=p;i++)
> {
> cin>>a>>b;
> SetZero(a,b);
> HashConn[a][b] = 1;
> HashConn[b][a] = 1;
> }
>
> ConnEndIndex = 0;
> LeftEndIndex = n;
> RemoveIndexFromLeft(1);
> AddIndexToSetConn(1);
> Build(n);
>
> }
>
> return 0;
> }
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