Merkkijono

input/code.cpp: In function 'int main()':
input/code.cpp:27:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if (inp.length() == len)
                       ^

#include <iostream>
#include <string>

int main()
{
	std::string inp;

	std::cin >> inp;

	while (true)
	{
		int len = inp.length();

		for (int i = 0; i < len - 1; i++)
		{
			if (inp[i] == inp[i + 1])
			{
				int j = i + 1;
				while ((j < len) && (inp[j] == inp[i]))
					j++;

				inp = inp.substr(0, i) + inp.substr(j);
				break;
			}
		}

		if (inp.length() == len)
			break;
	}

	std::cout << inp << std::endl;

	return 0;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED