Merkkijono

input/code.cpp: In function 'std::string foo(std::string)':
input/code.cpp:12:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < str.size(); ++i)
                                  ^

#include <iostream>
#include <vector>
#include <math.h>
#include <string>
#include <map>

using namespace std;

string foo(string str) {
    //map<int, bool> deleted;
    int streak = 1;
    for (int i = 0; i < str.size(); ++i)
    {
        //cout << "i: " << i << '\n';
        if (str[i] != str[i+1] && streak > 1) {
            str.erase(i-streak+1, streak);
            streak = 1;
            i-=3;
            //cout << "erase: " << str << '\n';
        } else if (str[i] == str[i+1]) {
            streak++;
        }
    }
    return str;
}

int main() {
    string str;
    cin >> str;
    cout << foo(str) << '\n';
    return 0;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: WRONG ANSWER

Test 3

Verdict: ACCEPTED

Test 4

Verdict: WRONG ANSWER

Test 5

Verdict: WRONG ANSWER

Test 6

Verdict: WRONG ANSWER

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED