Babaza Game

#include <bits/stdc++.h>
using namespace std;

bool babaza(string a) {
    for (unsigned i = 0; i < a.length()-1; i++) {
        if (a[i] == a[i+1]) return false;
    }
    return true;
}

int main() {
	string a,b;
    cin >> a >> b;
    
    string absdiff = a;
    string ldiff = a, rdiff = a;
    for (unsigned i = 0; i < a.length(); i++) {
        absdiff[i] = b[i] != a[i];
        if (i%2) {
            ldiff[i] = b[i];
        } else {
            rdiff[i] = b[i];
        }
    }
    if (babaza(absdiff)) {
        cout << a << '\n';
        cout << b << '\n';
        return 0;
    }

    if (ldiff == b) {
        cout << a << '\n';
        cout << ldiff << '\n';
        cout << b << '\n';
        return 0; 
    }
    if (rdiff == b) {
        cout << a << '\n';
        cout << rdiff << '\n';
        cout << b << '\n';
        return 0; 
    }

    set<char> used = {};
    for (unsigned i = 0; i < a.length(); i++) {
        used.insert(a[i]);
        used.insert(b[i]);
    }
    char unused = 'A';
    for (;;unused++) {
        if (!(used.contains(unused))) {
            break;
        }
    }
    cout << a << '\n';
    for (unsigned i = 0; i < a.length(); i++) {
        if (i%2) {
            ldiff[i] = unused;
        }
    }
    cout << ldiff << '\n';
    for (unsigned i = 0; i < a.length(); i++) {
        if (!(i%2)) {
            ldiff[i] = b[i];
        }
    }
    cout << ldiff << '\n';
    cout << b << '\n';
    return 0; 
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: WRONG ANSWER

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

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

Test 11

Verdict: WRONG ANSWER

Test 12

Verdict: WRONG ANSWER

Test 13

Verdict: WRONG ANSWER

Test 14

Verdict: WRONG ANSWER