Merkkijono

input/code.cpp: In function 'std::string checkstr(std::string)':
input/code.cpp:13:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i<str.length(); i++) {
                                 ^
input/code.cpp:28:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if (len <= 1 || pos == (str.length()-1)) return str;
                                           ^

#include <iostream>
#include <algorithm>
#include <string>

using namespace std;

string checkstr(string str) {
    int pos = 0;
    int p = 0;
    int len = 1;
    int l = 1;
    
    for(int i = 0; i<str.length(); i++) {
        if (i>0 && str[i] == str[i-1]) {
            l++;
            if(l>len) {
                len = l;
                pos = p;
                
            }
        }
        else {
            l = 1;
            p = i;
        }
    }
    
    if (len <= 1 || pos == (str.length()-1)) return str;
    else return str.erase(pos,len);
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    
    string input;
    string check;
    
    cin >> input;
    int end = 0;
    while(end==0){
        check.assign(checkstr(input));
        if(check.compare(input) == 0) {
            cout << input << "\n";
            end=1;
        }
        else input.assign(check);
    }
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: WRONG ANSWER

Test 5

Verdict: WRONG ANSWER

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED