11.4

来源：互联网发布：四维设计软件编辑：程序博客网时间：2024/06/05 19:14

11.37

http://www.cs.fsu.edu/~lacher/courses/COP4531/fall13/lectures/containers2/slide04.html

11.38
@pezy

#include <unordered_map>#include <set>#include <string>#include <iostream>#include <fstream>#include <sstream>using std::string;void wordCounting(){    std::unordered_map<string, size_t> word_count;    for (string word; std::cin >> word; ++word_count[word]);    for (const auto &w : word_count)        std::cout << w.first << " occurs " << w.second << (w.second > 1 ? "times" : "time") << std::endl;}void wordTransformation(){    std::ifstream ifs_map("../data/word_transformation.txt"), ifs_content("../data/given_to_transform.txt");    if (!ifs_map || !ifs_content) {        std::cerr << "can't find the documents." << std::endl;        return;    }    std::unordered_map<string, string> trans_map;    for (string key, value; ifs_map >> key && getline(ifs_map, value); )        if (value.size() > 1) trans_map[key] = value.substr(1).substr(0, value.find_last_not_of(' '));    for (string text, word; getline(ifs_content, text); std::cout << std::endl)        for (std::istringstream iss(text); iss >> word; ) {            auto map_it = trans_map.find(word);            std::cout << (map_it == trans_map.cend() ? word : map_it->second) << " ";        }}

0 0