解题思路:
注意事项:数据类型!时间限制!等差数列求和公式【(首项+末项)*项数/2】
参考代码:
import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); int n = sc.nextInt(); int k = sc.nextInt(); int t = sc.nextInt(); long sum = 1; long sum2 = 0; long m = (long) (1 + n) * n / 2; for (int i = 1; i <= t; i++) { sum2 += sum; sum += m; m += (long) n * n; while (sum > k - 1) { sum = sum % k; } } System.out.println(sum2); } }
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