请问第一题for循环，为啥只过了18% public static void main(String[] args) { Scanner in = new Scanner(System.in); int n = in.nextInt(); double[] dp = new double[n+1]; double res = 0; if(n<=0){ }else { for (int i = 1; i < n + 1; i++) { dp[i] = dp[i - 1] + 1.0 / (5.0 * (2 * i - 1)) - 1.0 / (5.0 * 2 * i); res += dp[i]; } //输出数列的前n项的和，并且保留四位小数 System.out.printf("%.4f\n\r", res); //System.out.printf("%.4f\n\r",0.10004); } }