train

cv5/a_train.c

@@ -32,16 +32,27 @@ void print_train(struct car* first) {
 }
 
 void cancel_train(struct car* first) {   
+    struct car* this;
     if(first == NULL){
         exit(0);
     }
-    if(first->next == NULL){
-       struct car* this = first;
+    else if(first->next == NULL){
+       this = first;
        first = first->next;
        free(this);
+       first = NULL;
     }
-    cancel_train(first->next);
-    free(first);
+    else{
+        struct car* prev = first;
+        while(prev->next->next != NULL){
+            prev = prev->next;
+        }
+        this = prev->next;
+        prev->next = NULL;
+        free(this);
+    }
+    //cancel_train(first->next);
+    //free(first);
 
 }