for (int i = 0; i < n; i++) { for (int j = i + 1; j < n; j++) { for (int k = j + 1; k < n; k++) { count++; } }}以上循环中,count最后的值是怎么算出来的,求个计算过程,哪个大佬帮忙解答下,我算着算着老是绕晕了