tokenize_and_reorder

#include <cctype>
#include <iostream>

using namespace std;

int main(int argc, char const* argv[])
{
    char* buffer = new char[128];
    char** words = new char*[16];

    // 读入一行字符串
    cin.getline(buffer, 128);

    // 跳过开头的空白字符，找到第一个单词
    char* head = buffer;
    while (*head && isspace(*head)) {
        head++;
    }

    size_t word_idx = 0;
    words[word_idx++] = head;

    while (*head) {
        // 读第一个单词
        while (*head && !isspace(*head)) {
            head++;
        }

        // 跳过空白字符
        while (*head && isspace(*head)) {
            *head = '\0';
            head++;
        }

        words[word_idx++] = head;
    }

    // 输出单词数
    cout << word_idx - 1 << endl;

    // 读取输出顺序
    char* sequence = new char[word_idx];
    cin.getline(sequence, word_idx);

    // 输出单词
    for (size_t i = 0; i < word_idx - 1; i++) {
        cout << words[sequence[i] - '0'] << ' ';
    }

    cout << endl;

    delete[] buffer;
    delete[] words;
    delete[] sequence;
    return 0;
}