인프런 커뮤니티 질문&답변

            function solution(s){
                let stack = []
                let leng = stack.length
                for (i=0; i<s.length; i++){
                    stack.push(s[i])
                    if (stack[leng-2]+stack[leng-1] === '()'){
                        stack.pop()
                        stack.pop()
                    }
                }
                if (leng === 0){
                    return 'YES'
                } else {
                    return 'NO'
                }
            }
            
            let a="(()(()))(()()()))(";
            console.log(solution(a));