2710. Remove Trailing Zeros From a String

题目 #

Given a positive integer num represented as a string, return the integer num without trailing zeros as a string.

Example 1:

Input: num = "51230100"
Output: "512301"
Explanation: Integer "51230100" has 2 trailing zeros, we remove them and return integer "512301".

Example 2:

Input: num = "123"
Output: "123"
Explanation: Integer "123" has no trailing zeros, we return integer "123".

Constraints:

  • 1 <= num.length <= 1000
  • num consists of only digits.
  • num doesn’t have any leading zeros.

思路1 #

分析 #

  • 照着做，倒着找第一个非0的位置，裁剪

代码 # 

1func removeTrailingZeros(num string) string {
2	i := len(num)-1
3	for ; i >= 0 && num[i] == '0'; i-- {
4	}
5	return num[:i+1]
6}