1 1 1 1 1 2 , 3 2 2 2 2 2, 3 3 3 3 3 4, java code example Example: 1 2 1 3 2 1 4 3 2 1 3 2 1 2 1 1 java 1 2 1 3 2 1 4 3 2 1 5 4 3 2 1