GUESSTHE

Guess the Number

Link to the question : GUESSTHE 

HINT :

We need to find the LCM of the numbers which are given a Y, and then check for the numbers which are given N, whether they divide the LCM.

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SOURCE CODE :

#include<stdio.h>
long long int gcd(long long int a,long long int b)
{
    if(b>a)
        return gcd(b,a);
    else if(b==0)
        return a;
    else
        return gcd(b,a%b);
}
long long int lcm(long long int a,long long int b)
{
    return a*b/gcd(a,b);
}
int main()
{
    char c,a[22];

    while(1) {
            int i=1,j=0;
            long long int k=1;
            scanf("%c",&c);
            while(c!='\n'&&c!='*')
           {



                      if(c=='Y')
                          k= lcm(k,i);
                     else if(c=='N')
                           a[j++]= i;
                     i++;
                     scanf("%c",&c);


           }
           if(c=='*')
            return 0;
            else {
           for(i=0;i<j;i++)
           {
               if(k%a[i]==0)
               {
                   k=-1;
                   break;
               }
           }
           printf("%lld\n",k);
            }
    }

}