From 7741c40d36d952e68de9f6a7115a6424954af9a2 Mon Sep 17 00:00:00 2001
From: Ren Baoshuo <i@baoshuo.ren>
Date: Sat, 17 Jul 2021 19:35:19 +0800
Subject: [PATCH] =?UTF-8?q?854.=20Floyd=E6=B1=82=E6=9C=80=E7=9F=AD?=
 =?UTF-8?q?=E8=B7=AF?=
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https://www.acwing.com/problem/content/submission/code_detail/6498911/
---
 AcWing/854/854.cpp | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 AcWing/854/854.cpp

diff --git a/AcWing/854/854.cpp b/AcWing/854/854.cpp
new file mode 100644
index 00000000..0ae51786
--- /dev/null
+++ b/AcWing/854/854.cpp
@@ -0,0 +1,34 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int n, m, k, x, y, z, f[205][205];
+
+int main() {
+    cin >> n >> m >> k;
+    for (int i = 1; i <= n; i++) {
+        for (int j = 1; j <= n; j++) {
+            f[i][j] = i == j ? 0 : 0x3f3f3f3f3f;
+        }
+    }
+    for (int i = 1; i <= m; i++) {
+        cin >> x >> y >> z;
+        f[x][y] = min(f[x][y], z);
+    }
+    for (int k = 1; k <= n; k++) {
+        for (int i = 1; i <= n; i++) {
+            for (int j = 1; j <= n; j++) {
+                f[i][j] = min(f[i][j], f[i][k] + f[k][j]);
+            }
+        }
+    }
+    for (int i = 1; i <= k; i++) {
+        cin >> x >> y;
+        if (f[x][y] > 0x1fffffff) {
+            cout << "impossible" << endl;
+        } else {
+            cout << f[x][y] << endl;
+        }
+    }
+    return 0;
+}