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input/code.cpp: In function 'int main()':
input/code.cpp:21:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int j = 0; j + 1 < s.length(); j++) {
                                    ^
input/code.cpp:23:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while (j + 1 < s.length() && s[j] == s[j + 1]) {
                             ^

#include <bits/stdc++.h>

#define N (1<<19)
#define ll long long
#define ld long double
#define M 1000000007
#define INF 0x5ADFACE5
#define LINF 0x51DEEFFEC7C0DECALL
#define pii pair<int, int>
#define pll pair<long long, long long>
#define F first
#define S second

using namespace std;

int main () {
	string s;
	cin>>s;
	int n = s.length();
	for (int i = 0; i < n; i++) {
		for (int j = 0; j + 1 < s.length(); j++) {
			if (s[j] == s[j + 1]) {
				while (j + 1 < s.length() && s[j] == s[j + 1]) {
					s = s.substr(0, j + 1) + s.substr(j + 2);
				}
				s = s.substr(0, j) + s.substr(j + 1);
				break;
			}
		}
	}
	cout<<s<<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