组合题6 个小题
已作答 0 / 6
假设输入的 x 是不超过 1000 的自然数,完成下面的判断题和单选题:
1 2#include <iostream>3using namespace std;4 5const int n = 100000;6const int N = n + 1;7 8int m;9int a[N], b[N], c[N], d[N];10int f[N], g[N];11 12void init()13{14 f[1] = g[1] = 1;15 for (int i = 2; i <= n; i++) {16 if (!a[i]) {17 b[m++] = i;18 c[i] = 1, f[i] = 2;19 d[i] = 1, g[i] = i + 1;20 }21 for (int j = 0; j < m && b[j] * i <= n; j++) {22 int k = b[j];23 a[i * k] = 1;24 if (i % k == 0) {25 c[i * k] = c[i] + 1;26 f[i * k] = f[i] / c[i * k] * (c[i * k] + 1);27 d[i * k] = d[i];28 g[i * k] = g[i] * k + d[i];29 break;30 }31 else {32 c[i * k] = 1;33 f[i * k] = 2 * f[i];34 d[i * k] = g[i];35 g[i * k] = g[i] * (k + 1);36 }37 }38 }39}40 41int main()42{43 init();44 45 int x;46 cin >> x;47 cout << f[x] << ' ' << g[x] << endl;48 return 0;49}init 函数的时间复杂度为( )。