题解 | 小红的地砖

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int num = in.nextInt();
        long dp[] = new long[num];
        for(int i = 0; i < num; i++){
            if(i==0){
                dp[i] = in.nextInt();
                continue;
            }else if(i==1){
                dp[i] = dp[i-1] + in.nextInt();
            }else{
                int cost = in.nextInt();
                dp[i] = Math.min(dp[i-1] + cost, dp[i-2]+cost);
            }
        }
        System.out.println(dp[num-1]);
    }
}