LightOj 1109 - False Ordering

#include <bits/stdc++.h>
using namespace std;
#define n 1000005
bool a[n];
long long int k=1;
long long int twin[n],i,j,t;
bool compare(const pair<long long int,long long int>&x, const pair<long long int, long long int>&y )
{

    return (x.second<y.second);

}
void sieve()
{
    long long int i,j;
    a[0]=a[1]=1;
    for(i=4;i<=n;i=i+2)
    {
        a[i]=1;
    }
    for(i=3;i<=sqrt(n);i=i+2)
    {
        for(j=i*i;j<=n;j=j+2*i)
        {
            a[j]=1;        //3*3, 3*5,3*7.....
        }
    }
    for(i=2;i<=n;i++)
    {
        if(a[i]==0)
        {
           twin[k]=i;
           k++;
        }
    }

}

long long int nod(long long int q)
{
        long long int g,c,r,s,h,l,m;
        m=q;
        r=1;
        h=0;
        for(g=1;g<=k && twin[g]<=sqrt(m);g++)
        {
            c=0;
            if(m%twin[g]==0)
            {

            while(m%twin[g]==0)
            {
                c++;
                m=m/twin[g];
                if(m==0 || m==1)
                {
                    break;
                }

             }
              s=c+1;
              r=r*s;
            }



        }
        if(m!=1)
        {
            r=r*2;    //for prime numbers there are only 2 divisors.
        }

        return r;

}

int main()
{
    long long int cnt,u,y,w,z,in,b[1005];
    //freopen("1109in.txt","r",stdin);
    //freopen("1109out.txt","w",stdout);
    vector<pair<long long int,long long int> >v;
    vector<long long int>res;
    sieve();
    for(z=1000;z>=1;z--)
    {
        cnt=nod(z);
        //cout<<z<<" "<<cnt<<endl;
        v.push_back(make_pair(z,cnt));
    }
    stable_sort(v.begin(),v.end(),compare);
    vector<pair<long long int,long long int> >::iterator p;

    for(p=v.begin();p!=v.end();p++)
    {
        in=p->first;
        res.push_back(in);

    }
    for(z=0;z<res.size();z++)
    {
        b[z]=res[z];
    }
    scanf("%lld",&t);
    for(w=1;w<=t;w++)
    {
        scanf("%lld",&u);
        printf("Case %lld: %lld\n",w,b[u-1]);


    }

    return 0;
}

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About Ashadullah Shawon

I am Ashadullah Shawon. I am a Software Engineer. I studied Computer Science and Engineering (CSE) at RUET. I Like To Share Knowledge. Learn More: Click Here