From 0c1c23e4005b52b080b6dc2f035cd0c2c272148e Mon Sep 17 00:00:00 2001
From: Kirito <1362050620@qq.com>
Date: Wed, 12 Oct 2016 10:36:29 +0800
Subject: [PATCH] Update and rename 3562_unfinished.cpp to 3562.cpp

God damn it !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
---
 SDUTOJ/3562.cpp            | 98 ++++++++++++++++++++++++++++++++++++++
 SDUTOJ/3562_unfinished.cpp | 97 -------------------------------------
 2 files changed, 98 insertions(+), 97 deletions(-)
 create mode 100644 SDUTOJ/3562.cpp
 delete mode 100644 SDUTOJ/3562_unfinished.cpp

diff --git a/SDUTOJ/3562.cpp b/SDUTOJ/3562.cpp
new file mode 100644
index 0000000..56510da
--- /dev/null
+++ b/SDUTOJ/3562.cpp
@@ -0,0 +1,98 @@
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <algorithm>
+#include <queue>
+using namespace std;
+#define INF 0x3f3f3f3f
+
+/** SPFA 单源最短路径算法 不支持负环*/
+#define MAXN 1005
+int d[MAXN];/// distance [ From S to ... ]
+bool v[MAXN];/// visit
+int q[MAXN];/// 基于数组的队列(也可用queue等...)
+int mp[MAXN][MAXN]; /// mp[i][j] i<--> j is connected.
+int n;/// n is the number of max Point .
+
+int path[MAXN];
+
+void spfa(int StartPoint) /// d[i] is the min distance from StartPoint to i ( Both >=1 )
+{
+    for(int i=0; i<=n; i++)
+    {
+        if(mp[0][i]!=INF)path[i]=i;//Path Init
+        d[i]=INF;
+        v[i]=0;
+    }
+    queue<int> bus;
+    bus.push(StartPoint);
+    v[StartPoint]=1;
+    d[StartPoint]=0;
+    while(!bus.empty())
+    {
+        int c=bus.front();
+        bus.pop();
+        //v[c]=0;
+        for(int i=0; i<=n; i++)
+        {
+            /// Here : if your mp[i][j] use INF as infinite, then use mp[c][i]!=INF.
+            /// Or you may use mp[i][j]!=-1 && d[i] > d[c] + mp[c][i]
+            if( d[i]>d[c]+mp[c][i] )
+            {
+                d[i]=d[c]+mp[c][i];
+                //path[i]=min(path[i],path[c]);
+                if(!v[i])
+                {
+                    if(c) path[i]=path[c];
+                    v[i]==1;
+                    bus.push(i);
+                }
+            }
+
+            if(d[i]==d[c]+mp[c][i])
+            {
+                if(c)path[i]=min(path[i],path[c]);
+            }
+        }
+    }
+}
+
+int main()
+{
+    int t;
+    scanf("%d",&t);
+    while(t--)
+    {
+        int m;
+        scanf("%d%d",&n,&m);
+        if(!n&&!m) break;
+        n=n+1;
+
+        for(int i=0; i<=n; i++)
+        {
+            for(int j=0; j<=i; j++)
+            {
+                if(i==j) mp[i][j]=0;
+                else mp[i][j]=mp[j][i]=INF;
+            }
+        }
+        int tu,tv,tw;
+        for(int i=0; i<m; i++)
+        {
+            scanf("%d%d%d",&tu,&tv,&tw);
+            mp[tu][tv]=tw;
+        }
+
+
+
+        spfa(0);
+
+        if(d[n]<INF)
+        {
+            if(path[n]==n)printf("0\n");
+            else printf("%d\n",path[n]);
+        }
+        else printf("-1\n");
+    }
+    return 0;
+}
diff --git a/SDUTOJ/3562_unfinished.cpp b/SDUTOJ/3562_unfinished.cpp
deleted file mode 100644
index b036582..0000000
--- a/SDUTOJ/3562_unfinished.cpp
+++ /dev/null
@@ -1,97 +0,0 @@
-#include <iostream>
-#include <cstdio>
-#include <cstdlib>
-#include <cmath>
-#include <algorithm>
-#include <climits>
-#include <cstring>
-#include <string>
-#include <set>
-#include <map>
-#include <queue>
-#include <stack>
-#include <vector>
-#include <list>
-#define mod 1000000007
-#define inf 0x3f3f3f3f
-#define pi acos(-1.0)
-using namespace std;
-typedef long long ll;
-#define RANGE 1005
-#define MAX 0x3f3f3f3f
-int cost[RANGE][RANGE];
-int d[RANGE];
-bool used[RANGE];
-int n,m;
-int pre[1005];
-void spfa(int s)
-{
-    int i,j,now;
-    for(i=0;i<=n+1;i++)
-    {
-        d[i]=MAX;
-        used[i]=false;
-    }
-    int flag=0;
-    for(i=0;i<=n+1;i++)
-    {
-        if(cost[0][i]<MAX)pre[i]=i;//初始化pre数组
-    }
-    used[s]=true;
-    d[s]=0;
-    queue<int> q;
-    q.push(s);
-    while(!q.empty())
-    {
-        now=q.front();
-        q.pop();
-        for(i=0;i<=n+1;i++)
-        {
-            if(d[i]>d[now]+cost[now][i])
-            {
-                d[i]=d[now]+cost[now][i];
-                if(used[i]==0)
-                {
-                    if(now!=0)pre[i]=pre[now];
-                    used[i]==true;
-                    q.push(i);
-                }
-            }
-            if(d[i]==d[now]+cost[now][i])
-            {
-                    if(now!=0)pre[i]=min(pre[i],pre[now]);
-            }
-        }
-    }
-}
-int main()
-{
-    int i,j,a,b,c;
-    int we;
-    scanf("%d",&we);
-    while(we--)
-    {scanf("%d%d",&n,&m);
-        if(!n&&!m) break;
-        for(i=0;i<=n+1;++i)
-        {
-            for(j=0;j<=i;j++)
-            {
-                if(i==j)  cost[i][j]=0;
-                else  cost[i][j]=cost[j][i]=MAX;
-            }
-        }
-        for(i=0;i<m;i++)
-        {
-            scanf("%d%d%d",&a,&b,&c);
-            cost[a][b]=c;
-        }
-        spfa(0);
-        if(d[n+1]<MAX)
-        {
-            if(pre[n+1]==n+1)printf("0\n");
-            else printf("%d\n",pre[n+1]);
-        }
-        else printf("-1\n");
-    }
-    return 0;
-}