E - Levko and Game

https://codeforces.com/contest/360/submission/188179349

Codeforces/360/E/E.cpp

@@ -0,0 +1,130 @@
+#include <iostream>
+#include <algorithm>
+#include <array>
+#include <functional>
+#include <iterator>
+#include <memory>
+#include <queue>
+#include <tuple>
+#include <utility>
+#include <vector>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+const int N = 1e4 + 5;
+const long long INF = 0x3f3f3f3f'3f3f3f3f;
+
+int n, m, k, s1, s2, t;
+std::pair<int, int> limits[N];
+std::array<std::shared_ptr<int>, N> w;
+std::vector<std::pair<int, std::shared_ptr<int>>> g[N];
+std::tuple<int, int, int, int> edges[N];
+std::array<long long, N> dis1, dis2;
+bool vis[N];
+
+void dijkstra(std::array<long long, N> &dis, int s) {
+    std::fill(std::begin(dis), std::end(dis), INF);
+    std::fill(std::begin(vis), std::end(vis), false);
+
+    std::priority_queue<
+        std::pair<int, int>,
+        std::vector<std::pair<int, int>>,
+        std::greater<std::pair<int, int>>>
+        q;
+
+    q.emplace(0, s);
+    dis[s] = 0;
+
+    while (!q.empty()) {
+        int u = q.top().second;
+        q.pop();
+
+        if (vis[u]) continue;
+        vis[u] = true;
+
+        for (auto &e : g[u]) {
+            int v = e.first,
+                w = *e.second;
+
+            if (dis[v] > dis[u] + w) {
+                dis[v] = dis[u] + w;
+
+                q.emplace(dis[v], v);
+            }
+        }
+    }
+}
+
+bool solve(int x) {
+    bool flag = true;
+
+    while (flag) {
+        flag = false;
+
+        dijkstra(dis1, s1);
+        dijkstra(dis2, s2);
+
+        for (int i = 1; i <= k; i++) {
+            if (*w[i] == std::get<3>(edges[i]) && dis1[std::get<0>(edges[i])] < dis2[std::get<0>(edges[i])] + x) {
+                *w[i] = std::get<2>(edges[i]);
+                flag = true;
+            }
+        }
+    }
+
+    return dis1[t] < dis2[t] + x;
+}
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    cin >> n >> m >> k >> s1 >> s2 >> t;
+
+    for (int i = 1, u, v, w; i <= m; i++) {
+        cin >> u >> v >> w;
+
+        g[u].emplace_back(v, std::make_shared<int>(w));
+    }
+
+    for (int i = 1, u, v, l, r; i <= k; i++) {
+        cin >> u >> v >> l >> r;
+
+        edges[i] = {u, v, l, r};
+        w[i] = std::make_shared<int>(r);
+        g[u].emplace_back(v, w[i]);
+    }
+
+    for (int i = 1; i <= k; i++) {
+        dijkstra(dis1, s1);
+        dijkstra(dis2, s2);
+
+        if (dis1[std::get<0>(edges[i])] < dis2[std::get<0>(edges[i])]) {
+            *w[i] = std::get<2>(edges[i]);
+        }
+    }
+
+    if (solve(0)) {
+        cout << "WIN" << endl;
+
+        for (int i = 1; i <= k; i++) {
+            cout << *w[i] << ' ';
+        }
+
+        cout << endl;
+    } else if (solve(1)) {
+        cout << "DRAW" << endl;
+
+        for (int i = 1; i <= k; i++) {
+            cout << *w[i] << ' ';
+        }
+
+        cout << endl;
+    } else {
+        cout << "LOSE" << endl;
+    }
+
+    return 0;
+}