char* kangaroo(int x1, int v1, int x2, int v2) {
    
    char *s = malloc (10 * sizeof(char));
    int relativeSpeed;
    
    //if speed of kangaroo 1 is slower or equal to kangaroo 2,    they will never meet
    if (v1 <= v2) {
        s = "NO";
    }
    else {
        //finding relative speed
        relativeSpeed = x2 - x1;
        
        //If relativeSpeed % (v1 - v2) == 0, then the kangaroos will meet at some future time.
        if (relativeSpeed % (v1 - v2) == 0) {
            s = "YES";
        }
        else {
            s = "NO";
        }
    }
    
    return s;
    free(s);
}

public static String kangaroo(int x1, int v1, int x2, int v2) {
    // Write your code here
        int jumps = 0;
        if(x1 > x2 && v1 < v2){
            while (x1 != x2) {
                x1 = x1 + v1;
                x2 = x2 + v2;
                jumps++;
                if(x2 > x1)
                    return "NO";
            }
            return "YES";
        }
        else if(x2 > x1 && v2 < v1){
            while (x2 != x1) {
                x1 = x1 + v1;
                x2 = x2 + v2;
                jumps++;
                if(x1 > x2)
                    return "NO";
            }
            return "YES";
        }
        return "NO";
    }

def kangaroo(x1, v1, x2, v2):
    if v1 == v2:
        return 'NO'
    else:
        meet_jump_n = (x2 - x1)/(v1 - v2)
        if (meet_jump_n % 1 == 0) & (meet_jump_n > 0):
            return 'YES'
        else:
            return 'NO'