使用C++写一段程序，实现hangman游戏另一个版本evil hangman。

好的，以下是一个C++实现的evil hangman游戏：

#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <algorithm>
#include <cstdlib>
#include <ctime>

using namespace std;

// 读取文件中的单词列表
vector<string> loadWords(string filename) {
    vector<string> words;
    ifstream file(filename);
    if (file.is_open()) {
        string word;
        while (file >> word) {
            words.push_back(word);
        }
        file.close();
    } else {
        cout << "Error: cannot open file " << filename << endl;
    }
    return words;
}

// 找到单词中某个字符出现的位置
vector<int> findCharPositions(string word, char c) {
    vector<int> positions;
    for (int i = 0; i < word.length(); i++) {
        if (word[i] == c) {
            positions.push_back(i);
        }
    }
    return positions;
}

// 根据已猜测的字符和待猜测单词簇，选择一个最优的单词簇
vector<string> chooseWordGroup(vector<string>& wordList, vector<char>& guessedChars) {
    // 初始化单词簇
    vector<string> wordGroup(wordList.size(), "");
    for (int i = 0; i < wordList.size(); i++) {
        for (int j = 0; j < wordList[i].length(); j++) {
            if (find(guessedChars.begin(), guessedChars.end(), wordList[i][j]) != guessedChars.end()) {
                wordGroup[i] += wordList[i][j];
            } else {
                wordGroup[i] += "_";
            }
        }
    }

    // 找到最优的单词簇
    int maxCount = 0;
    vector<string> bestWordGroup;
    for (char c = 'a'; c <= 'z'; c++) {
        vector<string> tmpWordGroup(wordGroup.size(), "");
        for (int i = 0; i < wordGroup.size(); i++) {
            if (wordGroup[i].find("_") != string::npos) {
                tmpWordGroup[i] = wordGroup[i];
            } else {
                tmpWordGroup[i] = wordGroup[i][0];
            }
        }
        vector<int> counts(tmpWordGroup.size(), 0);
        for (int i = 0; i < tmpWordGroup.size(); i++) {
            vector<int> positions = findCharPositions(tmpWordGroup[i], c);
            for (int j = 0; j < positions.size(); j++) {
                counts[i]++;
            }
        }
        int newMaxCount = *max_element(counts.begin(), counts.end());
        if (newMaxCount > maxCount) {
            maxCount = newMaxCount;
            bestWordGroup.clear();
            for (int i = 0; i < counts.size(); i++) {
                if (counts[i] == newMaxCount) {
                    bestWordGroup.push_back(wordList[i]);
                }
            }
        }
    }
    return bestWordGroup;
}

int main() {
    // 加载单词列表
    vector<string> words = loadWords("words.txt");

    // 获取猜测单词长度
    int wordLength;
    cout << "Enter the length of the word to guess: ";
    cin >> wordLength;

    // 初始化待猜测单词簇
    vector<string> wordList;
    for (int i = 0; i < words.size(); i++) {
        if (words[i].length() == wordLength) {
            wordList.push_back(words[i]);
        }
    }

    // 初始化已猜测的字符
    vector<char> guessedChars;

    // 开始游戏
    while (wordList.size() > 1) {
        cout << "Guess a character: ";
        char c;
        cin >> c;
        guessedChars.push_back(c);
        wordList = chooseWordGroup(wordList, guessedChars);
        cout << "Possible words: ";
        for (int i = 0; i < wordList.size(); i++) {
            cout << wordList[i] << " ";
        }
        cout << endl;
    }

    // 游戏结束，输出答案
    cout << "The word is " << wordList[0] << endl;

    return 0;
}

在这个实现中，我们使用loadWords函数从文件中读取单词列表；使用findCharPositions函数找到单词中某个字符出现的位置；使用chooseWordGroup函数根据已猜测的字符和待猜测单词簇，选择一个最优的单词簇。在主函数中，我们首先加载单词列表，获取猜测单词长度，并初始化待猜测单词簇和已猜测的字符。然后，在while循环中，我们让用户猜测一个字符，并更新已猜测的字符和待猜测单词簇，直到待猜测单词簇中只剩下一个单词。最后，输出答案。

需要注意的是，这个实现中可能存在一些局限性和不足之处，可以根据实际情况进行改进和优化。