generate_parentheses
generate_parentheses.go 源码
package main
//生成括号
//暴力法，找出所有的括号组合，并且一一判断是否有效
func generateParenthesis1(n int) []string {
var res []string
generateHelper1(0, 2*n, "", &res)
return res
}
func generateHelper1(i int, n int, s string, res *[]string) {
if i == n {
if isValid(s) {
*res = append(*res, s)
}
return
}
generateHelper1(i+1, n, s+")", res)
generateHelper1(i+1, n, s+"(", res)
}
func isValid(s string) bool {
flag := 0
for _, v := range s {
if v == '(' {
flag++
}
if v == ')' {
flag--
}
if flag < 0 {
return false
}
}
return flag == 0
}
//递归
func generateParenthesis2(n int) []string {
var res []string
generateHelper2(0, 0, n, "", &res)
return res
}
func generateHelper2(left, right, n int, s string, res *[]string) {
if len(s) == 2*n {
*res = append(*res, s)
return
}
if left < n {
generateHelper2(left+1, right, n, s+"(", res)
}
if right < left {
generateHelper2(left, right+1, n, s+")", res)
}
}
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