做麻了,第一题就是简单的模拟,想到了long,但是最后sum不是long, public static void main(String[] args) { Scanner sc = new Scanner(System.in); int n = sc.nextInt(); int k = sc.nextInt(); long[] dp = new long[n]; int id = 0; for(int i=0; i<n; i++){ dp[i] = (long) (i + 1) *k; } long sum = 0; for(long num : dp){ sum +=num; } ...