'commit'

TangDou/AcWing_TiGao/T3/Floyd/344_2.cpp

@@ -7,8 +7,8 @@ const int N = 110;
 在INF这里wa了两发，习惯值 1e9 不是最大值（查找时判断一下可以避免，但。。。懒了）
 */
 int n, m;
-int mp[N][N];
 int g[N][N];
+int dis[N][N];
 int path[N][N];
 int ans[N];
 int cnt;
@@ -16,49 +16,49 @@ int mm;
 void floyd() {
     mm = INF;
     for (int k = 1; k <= n; k++) {
+        // dp
         for (int i = 1; i < k; i++) {
             for (int j = i + 1; j < k; j++) {
-                int x = g[i][j] + mp[k][i] + mp[k][j];
+                int x = dis[i][j] + g[k][i] + g[k][j];
                 if (x < mm) {
                     mm = x;
-                    int tmp = j;
+                    int tg = j;
                     cnt = 0;
 
-                    while (tmp != i) {
+                    while (tg != i) {
-                        ans[cnt++] = tmp;
+                        ans[cnt++] = tg;
-                        tmp = path[i][tmp];
+                        tg = path[i][tg];
                     }
                     ans[cnt++] = i;
                     ans[cnt++] = k;
                 }
             }
         }
-
+        // floyd
-        for (int i = 1; i <= n; i++) {
+        for (int i = 1; i <= n; i++)
-            for (int j = 1; j <= n; j++) {
+            for (int j = 1; j <= n; j++)
-                if (g[i][j] > g[i][k] + g[k][j]) {
+                if (dis[i][j] > dis[i][k] + dis[k][j]) {
-                    g[i][j] = g[i][k] + g[k][j];
+                    dis[i][j] = dis[i][k] + dis[k][j];
-                    path[i][j] = path[k][j];
+                    path[i][j] = path[k][j]; // 这咋还和我理解的不一样呢？
-                }
-            }
                 }
     }
 }
 
 int main() {
     while (cin >> n >> m) {
-        for (int i = 1; i <= n; i++) {
+        // 邻接矩阵初始化
+        for (int i = 1; i <= n; i++)
             for (int j = 1; j <= n; j++) {
-                g[i][j] = mp[i][j] = INF;
+                dis[i][j] = g[i][j] = INF;
                 path[i][j] = i;
             }
-        }
 
+        // 读入边
         while (m--) {
             int a, b, c;
             cin >> a >> b >> c;
-            g[a][b] = g[b][a] = min(g[a][b], c); // 防重边
+            g[a][b] = g[b][a] = min(g[a][b], c);
-            mp[a][b] = mp[b][a] = g[a][b];
+            dis[a][b] = dis[b][a] = g[a][b];
         }
 
         floyd();
@@ -67,7 +67,7 @@ int main() {
             puts("No solution.");
             continue;
         }
-        for (int i = 0; i < cnt; ++i) printf("%d%s", ans[i], (i == cnt - 1) ? "\n" : " ");
+        for (int i = 0; i < cnt; i++) printf("%d%s", ans[i], (i == cnt - 1) ? "\n" : " ");
     }
     return 0;
 }