B3647 【模板】Floyd

https://www.luogu.com.cn/record/130409897

Luogu/B3647/B3647.cpp

@@ -0,0 +1,47 @@
+#include <iostream>
+#include <cstring>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+const int N = 105;
+
+int n, m, f[N][N];
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    cin >> n >> m;
+
+    memset(f, 0x3f, sizeof(f));
+
+    for (int i = 1, u, v, w; i <= m; i++) {
+        cin >> u >> v >> w;
+
+        f[u][v] = f[v][u] = w;
+    }
+
+    for (int i = 1; i <= n; i++) {
+        f[i][i] = 0;
+    }
+
+    for (int k = 1; k <= n; k++) {
+        for (int i = 1; i <= n; i++) {
+            for (int j = 1; j <= n; j++) {
+                f[i][j] = std::min(f[i][j], f[i][k] + f[k][j]);
+            }
+        }
+    }
+
+    for (int i = 1; i <= n; i++) {
+        for (int j = 1; j <= n; j++) {
+            cout << f[i][j] << ' ';
+        }
+
+        cout << endl;
+    }
+
+    return 0;
+}