题目：

题解：

func compress(chars []byte) int {write, left := 0, 0for read, ch := range chars {if read == len(chars)-1 || ch != chars[read+1] {chars[write] = chwrite++num := read - left + 1if num > 1 {anchor := writefor ; num > 0; num /= 10 {chars[write] = '0' + byte(num%10)write++}s := chars[anchor:write]for i, n := 0, len(s); i < n/2; i++ {s[i], s[n-1-i] = s[n-1-i], s[i]}}left = read + 1}}return write
}