Merkkijono

input/code.cpp: In function 'std::string foo(std::string)':
input/code.cpp:13:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < str.size(); ++i)
                                  ^
input/code.cpp:26:34: 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;
    string result;
    for (int i = 0; i < str.size(); ++i)
    {
        if (str[i] != str[i+1] && streak > 1) {
            for (int j = 0; j < streak; ++j)
            {
                deleted[i-j] = true;
            }
            streak = 1;
            i--;
        } else {
            streak++;
        }
    }
    for (int i = 0; i < str.size(); ++i)
    {
        if (!deleted[i]) {
            result += str[i];
        }
    }
    return result;
}

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

Test 1

Verdict: WRONG ANSWER

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: WRONG ANSWER

Test 5

Verdict: WRONG ANSWER

Test 6

Verdict: WRONG ANSWER

Test 7

Verdict: WRONG ANSWER

Test 8

Verdict: WRONG ANSWER

Test 9

Verdict: WRONG ANSWER

Test 10

Verdict: WRONG ANSWER