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myCpps/!-OJcreater.cpp

@@ -12,7 +12,7 @@
 using namespace std;
 
 //***************************************
-const string CPPfile = "theGreatEscape_UVA10967"; //*
+const string CPPfile = "routeChange_UVA11833"; //*
 //***************************************
 
 ifstream fin(CPPfile + ".cpp");

myCpps/routeChange_UVA11833.cpp

@@ -2,12 +2,77 @@
 
 using namespace std;
 
-//ifstream fin("routeChange_UVA11833.in");
-//ofstream fout("routeChange_UVA11833.out");
+ifstream fin("routeChange_UVA11833.in");
+ofstream fout("routeChange_UVA11833.out");
+
+const int inf = INT_MAX / 3;
+
+struct segment
+{
+    int u;
+    int t;
+
+    bool operator < (const segment & temp) const
+    {
+        return t > temp.t;
+    }
+};
+segment _segment(int u, int t)
+{
+    segment temp{u, t}; return temp;
+}
 
 int main()
 {
-
+    while (true)
+    {
+        int n = 0, m = 0, cc = 0, kk = 0; fin >> n >> m >> cc >> kk;
+        if (n + m + cc + kk == 0) break;
+
+        vector<vector<int>> a(n, vector<int>(n, inf)),
+                            g(n);
+        for (int c = 1; c <= m; ++c)
+        {
+            int u, v, t; fin >> u >> v >> t;
+            a[u][v] = t; a[v][u] = a[u][v];
+            g[u].push_back(v); g[v].push_back(u);
+        }
+
+        int temp = 0;
+        vector<int> d(cc, 0);
+        for (int u = cc - 2; u >= 0; --u)
+        {
+            temp += a[u][u + 1];
+            d[u] = temp;
+        }
+
+        vector<int> dp(n, inf);
+        priority_queue<segment> pq; pq.push(_segment(kk, 0));
+        while (pq.empty() == false)
+        {
+            segment now = pq.top(); pq.pop();
+
+            if (now.t >= dp[now.u]) continue;
+
+            dp[now.u] = now.t;
+
+            if (now.u <= cc - 1)
+            {
+                dp[cc - 1] = min(dp[cc - 1], now.t + d[now.u]);
+                continue;
+            }
+
+            int size = g[now.u].size();
+            for (int i = 0; i <= size - 1; ++i)
+            {
+                int v = g[now.u][i];
+
+                pq.push(_segment(v, now.t + a[now.u][v]));
+            }
+        }
+
+        fout << dp[cc - 1] << '\n';
+    }
 
     return 0;
 }