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Re:把min 设成0x7FFFFFFF,WA,改为0x7FFFFF,AC 为甚么啊,

Posted by HEU_xiuyang at 2011-11-22 17:22:46 on Problem 3268
In Reply To:把min 设成0x7FFFFFFF,WA,改为0x7FFFFF,AC 为甚么啊, Posted by:ZJNU09220229 at 2010-10-30 17:09:34
> #include<stdio.h>
> #include<stdlib.h>
> #include<string.h>
> int f[1010][1010];
> int g[1010][1010];
> int D[1010],final[1010],a[1010];
> int n,m,x;
> int dijkstra(int x,int f[][1010])
> {
> 	int i,j,k,min,ans;
> 	for(i=1;i<=n;i++)
> 	{
> 		D[i]=f[x][i];
> 		final[i]=0;
> 	}
> 	final[x]=1;
> 	for(i=2;i<=n;i++)
> 	{
> 		min=0x7FFFFFFF;
> 		for(j=1;j<=n;j++)
> 		if(D[j]<min&&!final[j])
> 		{
> 			k=j;
> 			min=D[j];
> 		}
> 		final[k]=1;
> 		for(j=1;j<=n;j++)
> 		if(!final[j]&&(min+f[k][j]<D[j]))
> 		D[j]=min+f[k][j];
> 	}
> 	return 0;
> }
> int main()
> {
> 	int i,j,k,s,t,v,ans;
> 	while(scanf("%d%d%d",&n,&m,&x)!=EOF)
> 	{
> 		for(i=0;i<=n;i++)
> 		 for(j=0;j<=n;j++)
> 		g[i][j]=f[i][j]=0x7FFFFFFF;
> 		for(i=0;i<m;i++)
> 		{scanf("%d %d %d",&s,&t,&v);
> 		 if(f[s][t]>v)
> 		 f[s][t]=v;
> 		 if(g[t][s]>v)
> 		 g[t][s]=v;
> 		}
> 		memset(D,0,sizeof(D));
> 		for(i=1;i<=n;i++)
> 		f[i][i]=g[i][i]=0;
> 		  dijkstra(x,f);
> 		for(i=1;i<=n;i++)
>               a[i]=D[i];
>               memset(D,0,sizeof(D));
> 		dijkstra(x,g);
> 		for(i=1;i<=n;i++)
>               a[i]+=D[i];
> 		ans=0;
> 		for(i=1;i<=n;i++)
> 		if(a[i]>ans) ans=a[i];
> 		printf("%d\n",ans);
> 	}
> 	return 0;
> }
> 

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