class Solution int minCostClimbingStairsListint cost Listint dp=Listintfilled20; forint i=2;icostlength;i++ dpaddmindpi-1+costi-1dpi-2+costi-2; return dpdplength-1; 第4行执行出错Dart已导入da

To fix the error in line 4, you need to import the dart:core library. Add the following import statement at the beginning of your code:

import 'dart:core';

This will enable you to use the List class and other core Dart features.