Check Bracket Sequence

-
#include<bits/stdc++.h>
using namespace std;
int main()
{
    int i,f,top=-1,size;
    string s;
    cin>>s;
    size=s.size();
    char a[size];
    f=1;
    for(i=0;i<s.size() && f==1;i++)
    {
        if(s[i]=='(')
        a[++top]='(';
        else if(s[i]==')')
        {
            if(top==-1)
            f=0;
            else
            top-=1;
        }
    }
    if(top!=-1 || f==0)
    cout<<"invalid\n";
    else
    cout<<"Valid";
}

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