c – 如何检查向量中是否存在元素？

发布时间：2020-12-16 10:28:17 所属栏目：百科来源：网络整理

导读：这在Visual C 2010 Express上编译并运行正常,但它只检查[2]元素：“Fish”. int main() { vectorstring words; string temp; vectorstring disliked(3); disliked[0] = "Broccoli"; disliked[1] = "Mushrooms"; disliked[2] = "Fish"; while (cin temp) word

这在Visual C 2010 Express上编译并运行正常,但它只检查[2]元素：“Fish”.

int main()
    {
        vector<string> words;
        string temp;
        vector<string> disliked(3);
        disliked[0] = "Broccoli";
        disliked[1] = "Mushrooms";
        disliked[2] = "Fish";
        while (cin >> temp)
            words.push_back(temp);
        cout << "Number of words: " << words.size() << endl;
        for (int i=0; i<words.size(); ++i) {
            if (words[i]!=disliked[2])
                cout << words[i] << " ";
            else cout << "BLEEP" << " ";
        }
        cout << endl;
        keep_window_open();
        return 0;
    }

如何在不键入的情况下检查所有向量元素：

if (words[i]!=disliked[0] && words[i]!=disliked[1] && words[i]!=disliked[2])

？有关如何使其更好或更优雅的任何其他建议？

解决方法

if (std::find(disliked.begin(),disliked.end(),words[i]) == disliked.end()) {
   cout << words[i] << " ";
} else {
   cout << "BLEEP" << " ";
}

如果你替换std :: vector< string>不喜欢的(3);与std :: set< string>不喜欢;它工作得更快.

std::set<string> disliked;
disliked.insert("Broccoli");
disliked.insert("Mushrooms");
disliked.insert("Fish");
//....

if (disliked.find(words[i]) == disliked.end()) {
   cout << words[i] << " ";
} else {
   cout << "BLEEP" << " ";
}

（编辑：李大同）

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