自定义排序
class Solution {
public String minNumber(int[] nums) {
int n = nums.length;
String[] strs = new String[n];
for(int i = 0; i < n; i++) strs[i] = String.valueOf(nums[i]);
Arrays.sort(strs, (a, b) -> (a + b).compareTo(b + a));
return String.join("", strs);
}
}