delete pics to save space

1.2384.cpp

@@ -0,0 +1,61 @@
+#include<cstdio>
+#include<cstring>
+#include<cmath>
+#include<queue>
+using namespace std;
+const int mod=9987;
+const int maxn=1005;
+const int maxm=1000005;
+struct Edge
+{
+	int to,w;
+	Edge *next;
+};
+queue<int> q;
+int n,m,x,y,z;
+int pre[maxn][2],vis[maxn],tot=0;
+double dis[maxn];
+Edge *e[maxn],mem[maxm],*ecnt=mem;
+void AddEdge(int u,int v,int val)
+{
+	ecnt->to=v; ecnt->w=val; ecnt->next=e[u];
+	e[u]=ecnt++;
+}
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+    scanf("%d%d",&n,&m);
+    while(m-->0)
+    {
+        scanf("%d%d%d",&x,&y,&z);
+        AddEdge(x,y,z);
+    }
+    memset(dis,127,sizeof(dis));
+    dis[1]=0; vis[1]=1; q.push(1);
+    while(q.size())
+    {
+        int u=q.front();q.pop();
+        vis[u]=0;
+        for(Edge *it=e[u];it;it=it->next)
+        {
+            int v=it->to;
+            if(dis[v]>dis[u]+log(it->w))
+            {
+                dis[v]=dis[u]+log(it->w);
+                pre[v][0]=u;pre[v][1]=it->w;
+                if(!vis[v]) {vis[v]=1;q.push(v);}
+            }
+        }
+    }
+    int res=1,pos=n;
+    while(pos!=1)
+    {
+        res*=pre[pos][1];
+        res%=mod;
+        pos=pre[pos][0];
+    }
+    printf("%d\n",res);
+    return 0;
+}