/**
 * @param {string} s
 * @return {boolean}
 */
var isValid = function(s) {
    let x = s.length
    let y = s.split("");
    let stack = []
    if(s == ""){
        return true;
    }
    if(x == 1){
        return false;
    }
    for(let i =0; i < x; i++){
        if(y[i] == '{' || y[i] == '(' || y[i] == '['){
            stack.push(y[i]);
        }
        else{
            if(y[i]=="}"){
                if(stack[stack.length -1] == '{'){
                    stack.pop();
                }
                else{
                    return false;
                }
            }
            else if(y[i] == "]"){
                if(stack[stack.length -1] == '['){
                    stack.pop();
                }
                else{
                    return false;
                }
            }
            else if(y[i] == ")"){
                if(stack[stack.length -1] == '('){
                    stack.pop();
                }
                else{
                    return false;
                }
            }
            else{
                return false;
            }
        }
    }
    return stack.length == 0;
};