Merkkijono

#include <iostream>
#include <string>
using namespace std;
int main(int argc,char *argv[]){
    string arg;
    cin>>arg;
    bool changed=true;
    while(changed){
        changed=false;
        int len=arg.length();
        for(int i=0;i<len-1;i++){
            if(arg[i]==arg[i+1]){
                char character=arg[i];
                int j=0;
                for(;;j++){
                    if(character!=arg[i+j]){
                        break;
                    }
                }
                arg.erase(i,j);
                changed=true;
                break;
            }
        }
    }
    cout<<arg+"\n";
    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