Merkkijono

input/code.cpp: In function 'int main()':
input/code.cpp:14:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int i = 0; i < str.size(); ++i) {
                                ^

#include <string>
#include <vector>
#include <iostream>

int main()
{
	std::string str;
	std::cin >> str;
	str.push_back('#'); // Muuten koodi kaatuu jos jonon lopussa on kaksi samanlaista kirjainta.

	while (true) {
		char rep = false;
		size_t begin;
		for (int i = 0; i < str.size(); ++i) {
			if (rep) {
				if (str[i] != rep) {
					str.erase(begin, i-begin);
					break;
				}
			} else {
				if (str[i] == str[i+1]) {
					rep = str[i];
					begin = i;
				}
			}
		}
		if (!rep)
			break;
	}

	str.pop_back();
	std::cout << str << std::endl;
}

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