System.out.print("请输入参赛天数："); int n = scanner.nextInt(); int gold = 0, silver = 0, bronze = 0; for (int i = 0; i < n; i++) { System.out.printf("请输入第%d天的奖牌数（金 银 铜）：", i + 1); int g = scanner.nextInt(); int s = scanner.nextInt(); int b = scanner.nextInt(); gold += g; silver += s; bronze += b; } int total = gold + silver + bronze; System.out.printf("金牌：%d，银牌：%d，铜牌：%d，总奖牌数：%d\n", gold, silver, bronze, total); 加个n的范围(1≤n≤17)

好的，可以在读取 `n` 的值之后添加如下代码来判断 `n` 是否在范围内：

if (n < 1 || n > 17) {
    System.out.println("参赛天数必须在 1 到 17 之间");
    return;
}

完整代码如下：

import java.util.Scanner;

public class MedalCount {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.print("请输入参赛天数：");
        int n = scanner.nextInt();

        if (n < 1 || n > 17) {
            System.out.println("参赛天数必须在 1 到 17 之间");
            return;
        }

        int gold = 0, silver = 0, bronze = 0;

        for (int i = 0; i < n; i++) {
            System.out.printf("请输入第%d天的奖牌数（金 银 铜）：", i + 1);
            int g = scanner.nextInt();
            int s = scanner.nextInt();
            int b = scanner.nextInt();

            gold += g;
            silver += s;
            bronze += b;
        }

        int total = gold + silver + bronze;

        System.out.printf("金牌：%d，银牌：%d，铜牌：%d，总奖牌数：%d\n", gold, silver, bronze, total);
    }
}

这样，如果输入的 `n` 不在范围内，程序会输出错误提示并直接结束。