COIN (why am i getting wrong answer ) ???

Please help me out with this code…
or please explain me how the output of 100 is 120?

#include<stdio.h>

unsigned long long int t=1000000000,n,ans=0,s1,s2,s3,previous=0;

int main()
{
    while(scanf("%llu",&n)!=EOF)
    {
        s1=s2=s3=n;
    if(n>=0 && n<=t)
    {
    previous=n;
    ans=s1/2+s2/3+s3/4;
    s1=s1/2;s2=s2/3;s3=s3/4;
    while(ans>previous)
    {
        previous=ans;
        s1=s2=s3=ans;
        s1=s1/2;s2=s2/3;s3=s3/4;
        ans=s1+s2+s3;
    }
    printf("%llu\n",previous);
    }
    }
    return 0;

}

you are printing some extra value as well…check ur code again

You are printing some extra values.

please explain me how the output of 100 is 120?

The problem is a good dynamic programming example.You are missing the fact that you can further exchange the obtained coins for more coins.

ok.
I have changed my program according to what you are saying.
Now where is the mistake.?

#include<stdio.h>

unsigned long long int t=1000000000,n,ans=0,s1,s2,s3,previous=0,t1,t2,t3;

int main()
{
    while(scanf("%llu",&n)!=EOF)
    {
        previous=s1=s2=s3=n;
    if(n>=0 && n<=t)
    {
    s1=s1/2;s2=s2/3;s3=s3/4;
    ans=s1+s2+s3;
    while(ans>previous)
    {
        previous=ans;
        t1=counter(s1);
        t2=counter(s2);
        t3=counter(s3);
        s1=t1;
        s2=t2;
        s3=t3;
        ans=t1+t2+t3;
    }
    printf("%llu\n",previous);
    }
    }
    return 0;
}

int counter(unsigned long long int a1)
{

    return (a1/2 + a1/3 + a1/4);

}

You are returning the int from the counter function which is not correct that’s why it will be providing garbage values into the variables.

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