1. 编码 // 实现argsort功能template<typename T> std::vector<int> argsort(const std::vector<T>& array){const int array_len(array.size());std::vector<int> array_index(array_len, 0);for (int i = 0; i < array_len; ++i)array_index[i] = i;std::sort(array_index.begin(), array_index.end(),[&array](int pos1, int pos2) {return (array[pos1] < array[pos2]);});return array_index;} 2. 示例 #include <random>std::default_random_engine generator;std::uniform_int_distribution<int> distribution(1, 20);std::vector<int> vec_data;for (int i = 0; i < 10; ++i)vec_data.push_back(distribution(generator));for (int item : vec_data)td::cout << item << "t";std::vector<int> index = argsort(vec_data);std::cout << std::endl;for (int item : index)std::cout << item << "t";
结果：
13 3 15 6 5 12 10 6 19 41 9 4 3 7 6 5 0 2 8