牛客ID280561...：第五题来不及做，用深搜能过70%，提示超时了😂 import java.util.Scanner; public class Main { static int max = Integer.MIN_VALUE; public static void dfs(int[] price, int day, int money, int count){ if(money < 0) return; if(count < 0) return; if(day == price.length-1){ max = Math.max(max, money+count*price[price.length-1]); return; } //买股票 dfs(price, day+1, money-price[day], count+1); //卖股票 dfs(price, day+1, money+price[day], count-1); dfs(price, day+1, money, count); } public static void main(String[] args) { Scanner sc = new Scanner(System.in); int n = sc.nextInt(); int m = sc.nextInt(); int[] price = new int[n]; for (int i = 0; i < n; i++) { price[i] = sc.nextInt(); } dfs(price, 0, m, 0); System.out.println(max); } }