delete pics to save space

2.821.cpp

@@ -0,0 +1,43 @@
+#include<cstdio>
+#include<algorithm>
+using namespace std;
+const int maxn=105;
+const int oo=1<<29;
+int m[maxn][maxn];
+int a,b,n,kase,sum,cnt,i,j,k;
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+    while(scanf("%d%d",&a,&b)==2&&!(a==0&&b==0))
+	{
+        n=-1;
+        for(i=0;i<maxn;i++)
+            for(j=0;j<maxn;j++)
+                m[i][j]=(i==j?0:oo);
+        do
+		{
+            m[a][b]=1;
+            n=max(max(a,b),n);
+        }
+		while(scanf("%d%d",&a,&b)==2&&!(a==0&&b==0));
+        n++;
+        for(k=1;k<n;k++)
+            for(i=1;i<n;i++)
+                for(j=1;j<n;j++)
+                	m[i][j]=min(m[i][j],m[i][k]+m[k][j]);
+        sum=cnt=0;
+        for(i=1;i<n;i++)
+            for(j=1;j<n;j++)
+                if(m[i][j]<oo&&m[i][j])
+				{
+                    cnt++;
+                    sum+=m[i][j];
+                }
+        printf("Case %d: ",++kase);
+        printf("average length between pages = %.3lf clicks\n"
+			,(double)sum/cnt);
+    }
+    return 0;
+}