It's strange i got wa#1 and i sappose that first test isn't difficult... so perhaps I have problem whith input...

#include <stdio.h>
#include <iostream.h>

int main()
{

    char ar[10000];

    char c,c2;
    bool comment=false;
    int arifm=0,i=0,t;
    //FILE* f;
    //f=fopen("input.txt","r");
    while (scanf("%c",&c)!=EOF)
    {
    ar[i]=c;
    i++;
    }
    for (t=0;t<i;t++)
    {
        if (comment && ar[t]=='*' && t<i-1 && ar[t+1]==')')
        {
            if (!comment)
            {
                    cout<<"NO"<<"\n";
                    return 0;
            }
            comment=false;
            t++;
        }
        else if (!comment)
        {
            if (ar[t]=='(')
            {
                if (t<i-1 && ar[t+1]=='*')
                {
                    comment=true;
                    t++;
                }
                else arifm++;
            }
            else if (ar[t]==')')
            {
                arifm--;
                if (arifm<0)
                {
                    cout<<"NO"<<"\n";
                    return 0;
                }
            }else if (arifm>0)
            {
                if (!((ar[t]>=48 && ar[t]<=57)||ar[t]=='*'||ar[t]=='/'||ar[t]=='+'||ar[t]=='-'||ar[t]=='='))
                {
                    cout<<"NO"<<"\n";
                    return 0;
                }
            }




        }
    }
    if (arifm==0&& !comment)
    {
                    cout<<"YES"<<"\n";
                    return 0;
    }
    else
    {
                    cout<<"NO"<<"\n";
                    return 0;
    }

}