c++编程问题求正确解答

Question

问题遇到的现象和发生背景

用代码块功能插入代码，请勿粘贴截图

Answer 1

T1

#include<iostream>
using namespace std;
bool cmp(char x){
    if(x>='A' && x<='Z') return true;
    if(x>='a' && x<='z') return true;
    return false;
}
int main()
{
    string s;
    getline(cin,s);
    int head=0,tail=s.size(),flag=0;

    while (head<=tail){
        if(flag==0 && cmp(s[head])) flag = 1;
        else if(flag==1 && cmp(s[tail]))
        {
            flag = 0;
            char temp = s[head];
            s[head] = s[tail];
            s[tail] = temp;
        }
        flag == 0 ? head++ : tail--;
    }

    cout << s << endl;
    return 0;
}

T2 （更优化,只有长度大于1才显示前方数字）

#include<iostream>
using namespace std;
string ZIP(string s){
    string result = "";
    long num = 1,length = s.size();
    char flag = s[0];

    for(int z=1;z<length;z++){
        if(flag==s[z]) num++;
        else
        {
            result += flag;
            result += to_string(num);
            flag = s[z];
            num = 1;
        }
    }
    result += flag;
    result += to_string(num);
    return result.size() < s.size() ? result : s;
}
//  aaaaaba -> a5b1a1
int main()
{
    string s;
    cin >> s;
    cout << ZIP(s);
    return 0;
}