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input/code.cpp: In function 'std::string uus(std::string)':
input/code.cpp:37:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 1; i < s.length(); i++) {
                               ^
input/code.cpp:42:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for (int k = i; k < s.length(); k++) {
                                 ^

#include <iostream>
#include <string>
 
using namespace std;
 
string uus(string in);
 
// CAACCB
// ABBCDDDCCBE
// B
// AAAAAAAAAAA
 
int main() {
	string in;
	cin >> in;
 
	in = uus(in);
 
	while (true) {
		string ss = uus(in);
		if (in == ss) {
			break;
		}
		else {
			in = ss;
		}
	}
 
	cout << in << endl;
 
	return 0;
}
 
string uus(string in) {
	string s = in;
 
	for (int i = 1; i < s.length(); i++) {
		if (s[i] == s[i - 1]) {
			int alku = i - 1;
			int loppu = s.length() -1;
 
			for (int k = i; k < s.length(); k++) {
				if (s[k] != s[k - 1]) {
					loppu = k - 1;
					break;
				}
			}
			s.erase(alku, loppu - alku + 1);
		}
	}
	return s;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: WRONG ANSWER

Test 5

Verdict: WRONG ANSWER

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: WRONG ANSWER

Test 10

Verdict: ACCEPTED