delete pics to save space

3.36286.cpp

@@ -0,0 +1,46 @@
+#include<cstdio>
+#include<cstring>
+template<typename T> inline void read(T& t)
+{
+    t=0; int ch,f=false;
+    while(ch=getchar(),!((ch>='0'&&ch<='9')||ch=='-'));
+    if(ch=='-') f=true,ch=getchar();
+    t=ch^48;
+    while(ch=getchar(),ch>='0'&&ch<='9') t=t*10+(ch^48);
+    if(f) t=-t;
+}
+template<typename T,typename... Args> inline void read(T& t,Args&... args) { read(t); read(args...); }
+inline int min(const int &a,const int &b) { return a<b?a:b; }
+const int maxn=1005;
+const int oo=0x3f3f3f3f;
+int dis[maxn][maxn],G[maxn][maxn];
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	int n,m,a,b,c,res=oo;
+	memset(G,0x3f,sizeof(G));
+	read(n,m);
+	while(m-->0)
+	{
+		read(a,b,c);
+		G[a][b]=G[b][a]=c;
+	}
+	memcpy(dis,G,sizeof(dis));
+	for(int k=1;k<=n;++k)
+	{
+		for(int i=1;i<k;++i)
+			for(int j=1;j<i;++j)
+				if((dis[i][j]^oo)&&(G[j][k]^oo)&&(G[k][i]^oo))
+					res=min(res,dis[i][j]+G[j][k]+G[k][i]);
+		for(int i=1;i<=n;++i)
+			for(int j=1;j<i;++j)
+			{
+				int tmp=dis[i][k]+dis[k][j];
+				if(tmp<dis[i][j]) dis[i][j]=dis[j][i]=tmp;
+			}
+	}
+	printf("%d\n",res);
+	return 0;
+}