Codecraft-17 and Codeforces Round #391 (Div. 1 + Div. 2, combined) (B. Bash's Big Day)

Bismillahir Rahmanir Rahim

///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;
map<ll,ll>mp;
map<ll,ll>::iterator it;
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    ll num,ans=1,bro;
    cin>>num;
    while(num--)
    {
        cin>>bro;
        if(bro%2==0)
        {
            mp[2]++;
            while(bro%2==0) bro/=2;
        }
        for(ll i=3; i*i<=bro; i+=2)
            if(bro%i==0)
            {
                mp[i]++;
                while(bro%i==0)
                    bro/=i;
            }
        if(bro>=2)
            mp[bro]++;
    }
    for(it=mp.begin();it!=mp.end();it++) ans=max(ans,it->second);
    cout<<ans<<endl;
    return 0;
}
///Alhamdulillah

Problem Link: https://codeforces.com/problemset/problem/757/B

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