C++自定义函数生成不重复的随机数

vector<int> getRandom(int total)  {      srand((int)time(NULL));      std::vector<int> input = *new std::vector<int>();      for (int i = 0; i < total; i++) {          input.push_back(i);      }      vector<int> output = *new vector<int>();             int end = total;      for (int i = 0; i < total; i++) {          vector<int>::iterator iter = input.begin();          int num = random()%end;          iter = iter+num;          output.push_back(*iter);          input.erase(iter);          end--;      }             return output;  }