'commit'

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

@@ -8,29 +8,27 @@ const int N = 110;
 */
 int n, m;
 int g[N][N];
-int dis[N][N];
+int dis[N][N]; // dp结果数组
 int path[N][N];
 int ans[N];
 int cnt;
-int mm;
+int res = INF;
 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 = dis[i][j] + g[k][i] + g[k][j];
-                if (x < mm) {
-                    mm = x;
-                    int tg = j;
-                    cnt = 0;
+            for (int j = i + 1; j < k; j++) { // i,j,k序号由小到大
+                if (res > dis[i][j] + g[i][k] + g[k][j]) {
+                    res = dis[i][j] + g[i][k] + g[k][j];
 
-                    while (tg != i) {
-                        ans[cnt++] = tg;
-                        tg = path[i][tg];
+                    int x = j, y = i;
+                    cnt = 0;
+                    while (x != y) {
+                        ans[cnt++] = x;
+                        x = path[i][x];
                     }
-                    ans[cnt++] = i;
-                    ans[cnt++] = k;
+                    ans[cnt++] = y;
+                    ans[cnt++] = k; // 序号最大的节点k
                 }
             }
         }
@@ -50,7 +48,7 @@ int main() {
         for (int i = 1; i <= n; i++)
             for (int j = 1; j <= n; j++) {
                 dis[i][j] = g[i][j] = INF;
-                path[i][j] = i;
+                path[i][j] = i; // 这里也是不一样，需要思考与整理
             }
 
         // 读入边
@@ -63,7 +61,7 @@ int main() {
 
         floyd();
 
-        if (mm == INF) {
+        if (res == INF) {
             puts("No solution.");
             continue;
         }