char* kangaroo(int x1, int v1, int x2, int v2) { while (1) { // Conditions where the kangaroos cannot meet if ((x1 > x2 && v1 > v2) || (x1 < x2 && v1 < v2) || (x1 != x2 && v1 == v2)) { return "NO"; }

    // Update positions
    x1 += v1;
    x2 += v2;

    // Check if they meet
    if (x1 == x2) {
        return "YES";
    }
}

}