Merkkijono

input/code.cpp: In function 'int firstDouble(std::string)':
input/code.cpp:8:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < s.length() - 1; i++) {
                                      ^
input/code.cpp: In function 'std::string removeChars(std::string, int)':
input/code.cpp:17:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while (loc + l < s.length() && s[loc + l] == s[loc]) {
                               ^

#include <iostream>
#include <string>

using namespace std;

int firstDouble(string s) {
    if (s.length() < 2) return -1;
    for (int i = 0; i < s.length() - 1; i++) {
        if (s[i] == s[i+1]) return i;
    }
    return -1;
}

string removeChars(string s, int loc) {
    string ns = s.substr(0, loc);
    int l = 0;
    while (loc + l < s.length() && s[loc + l] == s[loc]) {
        ++l;
    }
    return ns + s.substr(loc + l, s.length() - loc - l);
}

int main(int argc, const char * argv[]) {
    string s;
    cin >> s;
    int dloc = firstDouble(s);
    while (dloc > -1) {
        s = removeChars(s, dloc);
        dloc = firstDouble(s);
    }
    cout << s << 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