删除一组单词中的所有标点符号，或将txt文件中的所有唯一单词写入c++中的一组(不带标点符号)

#include <iostream>
#include <string>
#include <cctype>

std::string removePunctuation(const std::string& word) {
    std::string result;
    for (char c : word) {
        if (std::isalnum(c)) {
            result += c;
        }
    }
    return result;
}

int main() {
    std::string words[] = {"Hello,", "world!", "How", "are", "you?"};
    int numWords = sizeof(words) / sizeof(words[0]);

    for (int i = 0; i < numWords; i++) {
        std::string word = removePunctuation(words[i]);
        std::cout << word << " ";
    }

    return 0;
}

#include <iostream>
#include <fstream>
#include <string>
#include <set>
#include <cctype>

std::string removePunctuation(const std::string& word) {
    std::string result;
    for (char c : word) {
        if (std::isalnum(c)) {
            result += c;
        }
    }
    return result;
}

int main() {
    std::ifstream inputFile("input.txt");
    std::set<std::string> uniqueWords;

    if (inputFile.is_open()) {
        std::string line;
        while (std::getline(inputFile, line)) {
            std::string word;
            for (char c : line) {
                if (std::isalnum(c) || c == ' ') {
                    word += c;
                }
            }

            size_t startPos = 0;
            size_t endPos = word.find(' ');
            while (endPos != std::string::npos) {
                std::string singleWord = removePunctuation(word.substr(startPos, endPos - startPos));
                if (!singleWord.empty()) {
                    uniqueWords.insert(singleWord);
                }
                startPos = endPos + 1;
                endPos = word.find(' ', startPos);
            }

            std::string lastWord = removePunctuation(word.substr(startPos));
            if (!lastWord.empty()) {
                uniqueWords.insert(lastWord);
            }
        }

        inputFile.close();
    } else {
        std::cout << "Failed to open the input file." << std::endl;
        return 1;
    }

    for (const std::string& word : uniqueWords) {
        std::cout << word << std::endl;
    }

    return 0;
}