题解 | #有效括号序列#
有效括号序列
https://www.nowcoder.com/practice/37548e94a270412c8b9fb85643c8ccc2
/**
*
* @param s string字符串
* @return bool布尔型
*/
// 思路，利用栈结构；遍历字符串，只要当前val和栈顶不匹配，就push，匹配就pop，如果最后栈的长度==0，说明是匹配的
function isValid( s ) {
let arr = [...s]
let mystack = new myStack();
let reg = {'(':')',')':'(','{':'}','}':'{','[':']',']':'['}
arr.forEach(val=>{
if(mystack.peak() == reg[val]){
mystack.pop()
}else{
mystack.push(val)
}
})
return mystack.length() == 0?true:false
}
function myStack(str){
this.content = []
this.push = (val)=>{
this.content.push(val)
}
this.pop = ()=>{
return this.content.pop()
}
this.length = ()=>{
return this.content.length
}
this.init = (str)=>{
if(str) this.content = [...str]
}
this.peak = ()=>{
return this.content[this.content.length-1]
}
this.init(str)
}
module.exports = {
isValid : isValid
};
