下面的C++代码用于输出每个数对应的质因数列表，输出形如：{5: [5], 6: [2, 3], 7: [7], 8: [2, 2,
2]}。
int main() { int n, m; cin >> n >> m; if (n > m) swap(n, m); map<int, vector<int>> prime_factor; for (int i = n; i <= m; ++i) { int j = 2, k = i; while (k != 1) { if (k % j == 0) { prime_factor[i] = prime_factor[i] + j; k /= j; } else { ++j; } } } for (auto& p : prime_factor) { cout << p.first << ": "; for (int v : p.second) cout << v << " "; cout << endl; } return 0;}