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list.pop_back()
set.insert()
list.erase()
set.erase()

stringSplit(v1,",")
stringToInterger(numstr)
intergerToString(num)
int randomnumber= randomInterger(1,100) //1-100
a.find("Apple")
if (a.find("p")!= string::npos){ // string::npos 表示未找到，不存在
    return 0;
}

int main(){
    string data="a,b,c";
    vector<string> components=stringSplit(data,",");
    for (const string & word: components){ // &表示引用而非拷贝；word表示元素；string对应之前容器中的元素类型
        cout<<word<<ednl;
    }
    return 0;
}

//【‘a','b','c'】

int main(){
    string Data="ABC";
    cout << toLowerCase(Data)<<endl;
    return 0;
}
// "abc"

int main(){
    string input=getLine("Please Enter Here");
    cout <<"You Entered"<<input<<endl;
    return 0;
}

int main(){
    string str="Hello World";
    if (startWith(str,"Hello")){
        cout<<"String starts with Hello"<<endl;
    }
    return 0;
}