20. 有效的括号
代码
javascript
// 20. 有效的括号:https://leetcode.cn/problems/valid-parentheses/description/
// 输入:s = "()"
// 输出:true
export function isValidParentheses (s) {
const obj = {
')': '(',
'}': '{',
']': '['
}
const list = []
for (let i = 0; i < s.length; i++) {
if (list.length && list[list.length - 1] === obj[s[i]]) {
list.pop()
} else {
list.push(s[i])
}
}
return list.length === 0
}
typescript
// 20. 有效的括号:https://leetcode.cn/problems/valid-parentheses/description/
// 输入:s = "()"
// 输出:true
export function isValidParentheses (s: string): boolean {
const obj: { [key: string]: string } = {
')': '(',
'}': '{',
']': '['
}
const list = []
for (let i = 0; i < s.length; i++) {
if (list.length && list[list.length - 1] === obj[s[i]]) {
list.pop()
} else {
list.push(s[i])
}
}
return list.length === 0
}