c++编码解码字符串

以下是一个C++编码解码字符串的例子：

#include <iostream>
#include <string>
using namespace std;

// 编码字符串
string encodeString(const string& str) {
    string res = "";
    for (char c : str) {
        if (isdigit(c)) {
            res += c;
        } else {
            res += to_string((int)c);
        }
    }
    return res;
}

// 解码字符串
string decodeString(const string& str, size_t& index) {
    string res = "";
    while (index < str.size() && str[index] != ')') {
        if (isdigit(str[index])) {
            int count = 0;
            while (isdigit(str[index])) {
                count = count * 10 + (str[index] - '0');
                index++;
            }
            index++; // 跳过左括号
            string subStr = decodeString(str, index);
            index++; // 跳过右括号
            while (count-- > 0) {
                res += subStr;
            }
        } else {
            res += str[index++];
        }
    }
    return res;
}

int main() {
    string str = "3(a2(b))c";
    string encodedStr = encodeString(str);
    cout << "Encoded string: " << encodedStr << endl; // 输出：3(97 2(98))99
    size_t index = 0;
    string decodedStr = decodeString(encodedStr, index);
    cout << "Decoded string: " << decodedStr << endl; // 输出：aabbaabbcc

    return 0;
}