Method swap

app/src/main/java/solver/Utils.java:101–104

(int[] arr, int a, int b, int c, int d)

    }

    public static void swap(int[] arr, int a, int b, int c, int d) {
        int temp = arr[a]; arr[a] = arr[b]; arr[b] = temp;
        temp = arr[c]; arr[c] = arr[d]; arr[d] = temp;
    }

    public static void swap(int[] arr, int a, int b) {
        int temp = arr[a]; arr[a] = arr[b]; arr[b] = temp;