/** * 代码中的类名、方法名、参数名已经指定,请勿修改,直接返回方法规定的值即可 * * * @param s string字符串 * @return bool布尔型 */ function isValid(s) { // write code here let stack = []; for (let i = 0; i < s.length; i++) { if (s[i] == "}") { if (stack.length == 0 ||stack[stack.length-1] !== "{") return false; stack.pop(); } else if (s[i] == "]") { if (stack.length == 0 ||stack[stack.length-1] !== "[") return false; stack.pop(); } else if (s[i] == ")") { if (stack.length == 0 ||stack[stack.length-1] !== "(") return false; stack.pop(); } else { console.log(stack); stack.push(s[i]); } } if (stack.length > 0) return false; return true; } module.exports = { isValid: isValid, };