#include <iostream>

#include <stack>

#include <string>

std::string removeDuplicates(const std::string& input) {

? ? std::stack<char> stack;

? ? for (char c : input) {

? ? ? ? if (isdigit(c)) { // 判斷字符是否是數(shù)字

? ? ? ? ? ? if (stack.empty() || stack.top() != c) {

? ? ? ? ? ? ? ? stack.push(c);

? ? ? ? ? ? }

? ? ? ? }

? ? }

? ? std::string result;

? ? while (!stack.empty()) {

? ? ? ? result = stack.top() + result;

? ? ? ? stack.pop();

? ? }

? ? return result;

}

int main() {

? ? std::string input = "a1b22c333d4444e55555";

? ? std::string result = removeDuplicates(input);

? ? std::cout << "Original string: " << input << std::endl;

? ? std::cout << "String after removing duplicates: " << result << std::endl;

? ? return 0;

}