818D. Multicolored Cars - Codeforces Solution C++

➤  Problem Link : 818D. Multicolored Cars 

✅ C++ Solution :

 
#include<bits/stdc++.h>
using namespace std;

#define ll long long int

int main()
{
	int color[1000001]={0};
	int n,k;
	cin>>n>>k;
	int arr[n];
	for(int i=0;i<n;i++)
		cin>>arr[i];

	int i=0;
	unordered_set<int> st;
	while(i<n && arr[i]!=k)
	{
		color[arr[i]]++;
		st.insert(arr[i]);
		i++;
	}

	if(i==n)
		cout<<*(st.begin());
	else if(st.size()==0)
		cout<<"-1";
	else{

		color[arr[i]]++;
		while(1)
		{
			i++;
			while(i<n && arr[i]!=k)
			{
				color[arr[i]]++;
				i++;
			}

			if(i==n)
			{
				cout<<*(st.begin());
				exit(0);
			}
			color[arr[i]]++;
			auto it=st.begin();
			while(it!=st.end())
			{
				if(color[*it] >= color[k])
					it++;
				else
				{
					auto temp=it;
					it++;
					st.erase(temp);
				}
			}
			if(st.size()==0)
			{
				cout<<"-1";
				exit(0);
			}
		}


	}

}

 

Thank you for your patience reading. If you enjoyed this post, I’d be very grateful if you’d help it spread by emailing it to a friend, or sharing it on Whatsapp or Facebook. 

😇Happy Learning!!

• Tweet
• Share
• Share
• Share
• Share

About Utkarsh Gupta

I am a Member Technical at D.E. Shaw India Pvt. Ltd. CodingWithArt is a blog where you find tricks and solutions to challenging coding and development problems. I aim to build a universal tech platform for every enthusiast out there.