LEET代码问题 从字符串中删除元音 - Given a string `s`, remove the vowels `a`, `e`, `i`, `o`, `u` from it, and return the new string. 多少个数字小于当前数字 - Given the array `nums`, for each `nums[i]` find out how many numbers in the array are smaller than it. Tha is, for ea