Manthan, Codefest 16 (B. A Trivial Problem)

Bismillahir Rahmanir Rahim

Count how many fives because 5*2=10

///Author: Tanvir Ahmmad
///CSE,Islamic University,Bangladesh

#include<iostream>
#include<cstdio>
#include<algorithm>
#include<string>
#include<cstring>
#include<sstream>
#include<cmath>
#include<cstring>
#include<vector>
#include<queue>
#include<map>
#include<set>
#include<stack>
#include<vector>
#include<iterator>
#include <functional> ///sort(arr,arr+n,greater<int>()) for decrement of array
/*every external angle sum=360 degree
  angle find using polygon hand(n) ((n-2)*180)/n*/
///Floor[Log(b)  N] + 1 = the number of digits when any number is represented in base b
using namespace std;
typedef long long ll;

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    ll num,ans=-1;
    cin>>num;
    for(ll i=1;i<=1000000;i++)
    {
        ll bro=i,cnt=0;
        while(bro!=0) cnt+=(bro/5),bro/=5;
        if(cnt==num)
        {
            ans=i;
            break;
        }
    }
    if(ans==(-1)) cout<<"0"<<endl;
    else cout<<"5"<<endl<<ans<<" "<<ans+1<<" "<<ans+2<<" "<<ans+3<<" "<<ans+4<<endl;
    return 0;
}
///Alhamdulillah

Problem Link: https://codeforces.com/problemset/problem/633/B

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