Auto comment: topic has been updated by wakanda-forever (previous revision, new revision, compare).

As an author, I hope you'll enjoy the problems!

Best of luck to everyone — hoping you all see a nice rating increase !

Problems are really cool… would suggest everyone to give this contest and hope you enjoy it…

Participate or you will miss some truly beautiful problems.

As a tester, I can confirm this problem set is "beautiful".

I'm really happy to see frostcat as a problem setter. I hope we will enjoy this contest & get +ve delta

As a tester, I was forced to write an as a tester comment

As a tester, -. . ...- . .-. / --. — -. -. .- / --. .. ...- . / -.-- — ..- / ..- .--.

As a tester, the problems seemed really nice to me, except one.

which was ultra nice xD.

As a tester, I can confidently say that this problem set is beautifully designed — it’s genuinely fun and a joy to attempt.

As a tester, regarding questions I would say only one thing, think DP but apply greedy, or maybe vice versa, hope everyone has fun solving problem, all the best :)

Excited to participate and get some positive delta

Hey all these days I dont understand what is specific color testing and what they do in general ?

As a tester, I can confirm you’re gonna have a great time giving this contest. Don’t miss it!

As a tester, I made a video of solving all the problems. I'll put the stream very soon on Codeforces, don't miss it.

A contest with Interactive Problems , its going to be GREAT again

18o3 the tester OTZ

As a tester, the problems are really cool and fun to attempt. I hope you all have a beautiful increase in rating.

Good luck everyone! Hope your rating will increase

what about the recent decrease?(rollback)

All the best everyone! Hope everyone gets +ve delta.

huge thanks to the authors and testers for their hard work!!!! To all participant, hope your rating will increase

Best Luck for everyone in Div.3!!! :)

I hope there will be an interesting problems!

As a participant , seems interesting.

WAZAAAAA

As a participant, best of luck, everyone.

And hope this round will be beautiful for everyone!

Is cry's basement already full?

As a participant, SHAW!

cout << "Best of luck CODERS for this round!" << endl;

Be Ready for one INTERACTIVE Problem. there will be one.

Here is guide for Interactive Problems.

According to the poor situation of QueueForces's submission now, will it be rated?

Can I be a tester for a contest when I reach expert?

As a tester,I want to ask:is it rated?(doge

really excited to give an unrated round after a pathetic performance in last round.

hope to reach lgm this contest

div.3 ❌ div.2 ✅

I'm sorry about my words.In fact,I think it's an interesting round.

Also,I hope the cheaters will be banned.

All — Beautiful

i only got A :(

This round is Beautiful

How beautiful the problem are !

ConstructiveForces

how to H?

Oh my god. Please ban all unrated participants, I almost shocked when I see the common standings.

Multiple valid answers everywhere

Please ban the Unrated cheaters

the interactive snuffed me out, i hate those questions

(Bruteforces + Constructiveforces + Interactiveforces) Typeshit ?

constructive forces

D was such a beautiful problem. Thank you for the contest <3.

No way G went from 200 to 700 in like 5 minutes. Regardless a good contest.

Is problem D not just binary searching over smallest L and largest R, where the condition is checking if query "1 mid mid" yields a different value from query "2 mid mid"?

Was E that easy? Please give some hints.

lol what is this standing?

I only AC A and B, I used about half an hour to C. I don't know what I wrong...

Why did no sample case for B have a solution with a subsequence rather than a subarray?

Beautiful Permutation — Can someone help me in finding the issue with this code. I'm using binary search to find L and R.

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

ll ask(int type , int L , int R){
    cout << type << " " << L << " " << R << endl;
    cout.flush();
    ll sum ; cin >> sum;
    return sum;
}

int main(){
    int t ; cin >> t;

    while(t--){
        int N ; cin >> N;
        int L = 1 , R = N;

        int low = 1 , high = N;
        while(low <= high){
            int mid = (low + high) >> 1;
            ll original = ask(1 , 1 , mid);
            ll modified = ask(2 , 1 , mid);
            if(original != modified) high = (L = mid) - 1;
            else low = mid + 1;
        }

        low = 1 , high = N;
        while(low <= high){
            int mid = (low + high) >> 1;
            ll original = ask(1 , mid , N);
            ll modified = ask(2 , mid , N);
            if(original != modified) low = (R = mid) + 1;
            else high = mid - 1;
        }

        cout << "! " << L << " " << R << endl;
    }

    return 0;
}

bro, i was just lost in life after failing C for like the 10th time, and then i read "u gotta use the current a not initial" pmo

So many bots! How will CF handle this? Will this game still be rated?

problem in 2 problem ,this contest should be unrated now

Really great problems. Enjoyed!

Open the status page, and set the filters as follows: Problem G, Verdict Accepted, Language Python3. Look at the submissions that were made just before the contest ended. All of them (literally ALL) are unrated (black) people, and the running time and consumed memory of those submissions are mostly uniform. I looked at some submissions and they looked all AI-generated. They are almost all cheaters.

Coordinators and admins, please look into them.

UPD: I've found that other problems are in the similar situation; generally Python 3 submissions are filled with cheaters.

Hello, Constructiveforces!

CHEATFORCES Today,left after solving 4 problems at a ~3.5k rank came back and saw my rank to be 4.9k changed within last 12 minutes of the contest wow , so so many cheaters so annoying dont know how to keep myself motivated having these things

This is my code for problem C:

// this is code


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

int t, n;
int a,b;

int main(int argc, char const *argv[])
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cin >> t;
    for(int q=0;q<t;++q){
        cin>>a>>b;
        if(b==0){
            cout<<1<<"\n"<<"0\n";
            continue;
        }
        if(a<b) {
            cout<<"-1\n";
            continue;
        }
        if(a==b){
            cout<<"0\n";
            continue;
        }
        int kq=a^b;
        if(kq<=a) cout<<1<<"\n"<<kq<<"\n";
        else{
            int k1=kq^a;
            int k2=k1^b;
            cout<<2<<"\n"<<b<<" "<<a<<"\n";
        }
    }
    return 0;
}

I need an explaination why it is wrong:(((( Anybody please help me:((((

cheatforces

website got down like 5+ times during contest i dont know for indians or what

Beautiful contest, we should have more mainly constructive contests!

344346152 344346149 344344898 344348892 344348159 344348061

What a coincidence that they have the same code and the same comments

how to prove that we always have a solution for problem G except when n=2?

is it related to pigeonhole principle?