a = [2,7,4,3,2,7,4,3,5,1]a = [2,7,4,3,2,7,4,3,5,1]a = [2,7,4,3,2,7,4,3,5,1]a = [2,7,4,3,2,7,4,3,5,1]

a = [2,7,4,3,2,7,4,3,5,1]
a = [2,7,4,3,2,7,4,3,5,1]
a = [2,7,4,3,2,7,4,3,5,1]

题目是不是没说全,应该是a中的元素按顺序组合成最大的五位数吧

[7,4,3,5,1,2,7,4,3,2]为什么是最大的
7,7明显更大啊