package huawei import (     "fmt" ) func Test4Base() {     s := "abcfbcca"     result := deleteMinChars(s)     fmt.Println(result) } func deleteMinChars(s string) string {     countMap := make(map[rune]int, 0)     //统计出现次数     for _, v := range s {         countMap[v]++     }     //查找最少次数     var minCount int     for _, v := range countMap {         if minCount == 0 || v < minCount {             minCount = v         }     }     //删除字符串中出现次数为minCount的字符     for i := len(s) - 1; i >= 0; i-- {         if countMap[rune(s[i])] == minCount {             s = s[:i] + s[i+1:]         }     }     return s }