delete pics to save space

history_source/信息学奥赛一本通/3.4.3.3.cpp

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+#include<cstdio>
+#include<vector>
+#include<cstring>
+#include<queue>
+//#include"conio.h"
+using namespace std;
+long long e[85][85],dis[85],t,oo=1ll<<50;
+int n,s;
+char str[100];
+bool vi[85];
+queue<int> que;
+int main()
+{
+	freopen("shopth.in","r",stdin);
+	freopen("shopth.out","w",stdout);
+	scanf("%d%d",&n,&s);
+	for(int i=1;i<=n;i++)
+	{
+		for(int j=1;j<=n;j++)
+		{
+			scanf("%s",str);
+			if(strcmp(str,"-")!=0)
+			{
+				sscanf(str,"%lld",&t);
+				e[i][j]=t;
+			}
+			else e[i][j]=oo;
+//			fprintf(stderr,"%s ",str);
+		}
+//		fprintf(stderr,"\n");
+	}
+	for(int i=1;i<=n;i++) dis[i]=oo;
+	dis[s]=0;
+	vi[s]=1;
+	que.push(s);
+//	int es[]={12,13,14,15,12};
+//	fprintf(stderr,"oo=%lld\n",oo);
+//	long long sum=0;
+//	for(int i=0;i<5;i++)
+//	{
+//		fprintf(stderr,"%d - %d = %lld\n",es[i],es[i+1],e[es[i]][es[i+1]]);
+//		sum+=e[es[i]][es[i+1]];
+//	}
+//	fprintf(stderr,"sum=%lld\n",sum);
+//	getch();
+	while(que.size())
+	{
+		t=que.front();
+//		fprintf(stderr,"head=%d dis is %lld\n",que.front(),dis[t]);
+		vi[t]=0;
+		for(int i=1;i<=n;i++)
+			if(t!=i&&e[t][i]<oo&&dis[t]+e[t][i]<dis[i])
+			{
+				dis[i]=dis[t]+e[t][i];
+				if(!vi[i])
+				{
+					vi[i]=1;
+					que.push(i);
+				}
+//				fprintf(stderr,"\tinsert %d  father is %lld val=%lld=%lld+%lld\n",i,t,dis[i],dis[t],e[t][i]);
+			}
+		que.pop();
+	}
+	for(int i=1;i<=n;i++)
+		if(i!=s) printf("(%d -> %d) = %lld\n",s,i,dis[i]);
+	return 0;
+}