假设给定字符串 12345
使用穷举算法生成指定长度的字符串,如
假设生成长度为3的所有组合
111
112
113
114
115
121
122
123
124
125
131
132
133
。。。请求大佬出手,头发掉了好多没想出来
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```golang
func C(s string, length int) []string {
var sl int = len(s)
if sl < length || length <= 0 {
return nil
}
var M []string = make([]string, 0, sl)
for _, v := range s {
M = append(M, string(v))
}
var R []string = make([]string, sl, 1024)
copy(R, M)
for ; length-1 > 0; length-- {
var l = len(R)
for i := 0; i < l; i++ {
for j := 1; j < sl; j++ {
R = append(R, R[i]+M[j])
}
R[i] = R[i] + M[0]
}
}
return R
}
```
#3