Light OJ -- 1354(IP Checking)

Convert decimal to binary or binary to decimal

///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;
int main()
{
    ll tst,ca=1;
    cin>>tst;
    while(tst--)
    {
        int arr[10],arr1[10],num=0,num1=0,k=0,k1=0,flag=0;
        string str,str1;
        cin>>str>>str1;
        str.append(".");
        str1.append(".");
        for(ll i=0;i<str.size();i++)
        {
            if(str[i]=='.') arr[k++]=num,num=0;
            else num=(num*10)+(str[i]-48);
        }
        for(ll i=0;i<str1.size();i++)
        {
            if(str1[i]=='.') arr1[k1++]=num1,num1=0;
            else num1=(num1*10)+(str1[i]-48);
        }
        for(ll i=0;i<k;i++)
        {
            ll base=1,decimal=0;
            num=arr1[i];
            while(num!=0)
            {
                decimal+=(num%10)*base;
                num/=10;
                base*=2;
            }
            if(arr[i]!=decimal) flag=1;
        }
        printf("Case %lld: ",ca++);
        if(flag) cout<<"No"<<endl;
        else cout<<"Yes"<<endl;
    }
    return 0;
}
///Alhamdulillah

problem link:https://lightoj.com/problem/ip-checking

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