valid_parentheses
valid_parentheses.go 源码
package main
import (
"strings"
)
//有效的括号
//暴力求解，分别匹配并替换 () [] {}
func isValid1(s string) bool {
for len(s) > 0 {
n := len(s)
s = strings.Replace(s, "()", "", -1)
s = strings.Replace(s, "[]", "", -1)
s = strings.Replace(s, "{}", "", -1)
if len(s) == n {
break
}
}
return len(s) == 0
}
//第二种解法，借助一个栈
func isValid2(s string) bool {
m := map[rune]rune{')': '(', ']': '[', '}': '{'}
var stack []rune
for _, v := range s {
if _, ok := m[v]; !ok {
stack = append(stack, v)
} else {
if len(stack) == 0 || stack[len(stack)-1] != m[v] {
return false
}
stack = stack[:len(stack)-1]
}
}
return len(stack) == 0
}
// 另一种写法
func isValid3(s string) bool {
var stack []int
for _, v := range s {
if v == '(' {
stack = append(stack, ')')
} else if v == '[' {
stack = append(stack, ']')
} else if v == '{' {
stack = append(stack, '}')
} else {
if len(stack) == 0 || stack[len(stack)-1] != int(v) {
return false
}
stack = stack[:len(stack)-1]
}
}
return len(stack) == 0
}
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