C++ 优化循环：求解因子数 - 效率提升

#include <bits/stdc++.h>\nusing namespace std;\nlong int a;\nint cum;\nint main() {\n cin>>a;\n for (int i = 2; i <= a; i++) {\n for (int j = 1; j*j <= i; j++) {\n if (i % j == 0) {\n cum++;\n if (j != i/j) {\n cum++;\n }\n }\n }\n printf("%d ", cum);\n cum = 0;\n }\n return 0;\n}