include <iostream>

#include <vector>

int main()

{

std::srand((unsigned)time(0)); // 這句話沒有起作用，我試過用一個固定值或者註釋掉這句話，生成的序列都是一樣的

std::cout << "system time : " << time(0) << std::endl;

std::vector<int> v;

std::ostream_iterator<int> out_iter(std::cout, " ");

for(int i=0; i<10; ++i)

{

v.push_back(i);

}

std::random_shuffle(v.begin(), v.end());

copy(v.begin(), v.end(), out_iter);

std::cout << "\n";

return 0;

}