如果四位数各位上的数字均是0或2或4或6或8, 则统计出满足此条件的个数cnt, 并把这些四位数按从大到小的顺序存入数组b中-If the four-digit numbers that are 0 or 2 or 4 or 6 or 8, then the statistics to meet this condition the number of cnt, and by the smallest of these four-digit sequence into the array b i