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input/code.cpp: In function 'int main()':
input/code.cpp:12:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 1; i < syote.length(); i++) {
                                   ^
input/code.cpp:17:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    } while (i < syote.length() && syote[i] == edellinen);
                              ^

#include <iostream>

using namespace std;

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	string syote;
	cin >> syote;

	char edellinen = syote[0];
	for (int i = 1; i < syote.length(); i++) {
		if (syote[i] == edellinen) {
			syote.erase(--i, 1);
			do {
				syote.erase(i, 1);
			} while (i < syote.length() && syote[i] == edellinen);
			--i;
		}
		if (i < 0) i = 0;
		if (!syote.empty()) edellinen = syote[i];
	}
	cout << syote << 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