Valid parentheses

A daily topic ing, Today is a simple question Power button 20. Valid Parentheses

class Solution {
    
public:
    bool isValid(string s) {
    
        int stack[10010];
        memset(stack,0,10010);
        int i=0,j=-1;
        while(i<s.length()&&j<10000)
        {
    
            if(s[i]=='('||s[i]=='['||s[i]=='{')
            {
    
                stack[++j]=s[i];    
            }
            if(s[i]==')')
            {
    
                if(j<0||stack[j]!='(')
                    return false;
                j--;
            }
            if(s[i]==']')
            {
    
                if(j<0||stack[j]!='[')
                    return false;
                j--;    
            }
             if(s[i]=='}')
            {
    
                if(j<0||stack[j]!='{')
                    return false;
                j--;    
            }
            i++;
        }
        if(j!=-1)
            return false;
        return true;
    }
};