How about it? Virtual contest is a way to take part in past contest, as close as possible to participation on time. Connect and share knowledge within a single location that is structured and easy to search. https://codeforces.com/contest/1807/problem/C, Post Comments Your main function does it all, read input, calc result, and write the output. Codeforces Round 859 (Div. You can perform the following moves: $$$^{\dagger}$$$An alternating binary string is a string of $$$\texttt{0}$$$s and $$$\texttt{1}$$$s such that no two adjacent bits are equal. A tag already exists with the provided branch name. For example, 000000. Are modern compilers passing parameters in registers instead of on the stack? how were you able to go to such a page for a problem ? The problem statement has recently been changed. Never use someone else's code, read the tutorials or communicate with other person during a virtual contest. Codeforces Round 855 (Div. implementation strings. Manga where the MC is kicked out of party and uses electric magic on his head to forget things. How do I set my home country on Codeforces. Formatting: Don't be so stingy with the indentation, give your code some room to breathe! 3) 1454D - Number into Atcoder Beginner Contest 172 D - Sum of Divisors S Codeforces 1550B - Maximum Cost Deletion Solution. Is the DC-6 Supercharged? I would suggest you created a separate function to determine if the string is a palindrome: Note that the underlying data type for array indexes and length is size_t. P.S. In the third test case, you can make $$$\texttt{1}$$$, which is an alternating binary string. This repo contains the Detailed Explanation and implementation of Various Coding problems on various platforms in C++. Given a string s, divide it into two non-empty strings a and b in such a way that f (a)+f (b) is as large as possible. All caught up! Is that what you mean? The input consists of multiple test cases. The site is, however, searchable in Google, but it isn't nearly as convenient as a built-in solution would be. Cannot retrieve contributors at this time. Round 889 Question B, Interactive Problems: Guide for Participants, Atcoder problem statement of F Cans and Openers, UNIQUE VISION Programming Contest 2023 Summer(AtCoder Beginner Contest 312) Announcement. We read every piece of feedback, and take your input very seriously. Solutions to problems from various online judges / contest sites. A palindrome is a string that reads the same backward as forward, for example strings "z", "aaa", "aba", "abccba" are palindromes, but strings "codeforces", "reality", "ab" are not. Learn more about Stack Overflow the company, and our products. Join two objects with perfect edge-flow at any stage of modelling? For the first time ever, I recorded a video for Youtube, and first time experiences are worth sharing. ), Codeforces 271A Beautiful Year Solution, Codeforces 1154 A. Can I sort / filter the submissions by language somehow or is there a color coding that I don't understand yet? You signed in with another tab or window. Generally speaking, if you have an O(n) iteration (where n is the number of elements), then irrespective of where you start (from the end, middle or top), the complexity will still work out to be O(n).That's why your approach times out: you're using a linear . The only programming contests Web 2.0 platform. To learn more, see our tips on writing great answers. Are you sure you want to create this branch? Replace $$$\texttt{a}$$$ with $$$\texttt{0}$$$. Making statements based on opinion; back them up with references or personal experience. Adjacent Replacements.cpp 1017 A. The first line of each test case contains an integer $$$n$$$ ($$$1 \leq n \leq 2000$$$) the length of the string $$$s$$$. The link is here. Posting a blog should be used as a last option. See operations below: A:100000; B:100001; A:110001; B:110011; A:111011; B: reverse; A: 111111. Now the string is $$$\color{red}{\texttt{0}}\texttt{b}\color{red}{\texttt{0}}\texttt{c}\color{red}{\texttt{0}}\texttt{b}\color{red}{\texttt{0}}$$$. Print "YES" (without quotes) if Mike can change exactly one character so that the resulting string is palindrome or "NO" (without quotes) otherwise. Learn more about the CLI. In the second test case, the only possible binary strings you can make are $$$\texttt{00}$$$ and $$$\texttt{11}$$$, neither of which are alternating. Can we define natural numbers starting from another set other than empty set? Once reaching that, there's a box to the right. Round 889 Question B, Interactive Problems: Guide for Participants, Atcoder problem statement of F Cans and Openers, UNIQUE VISION Programming Contest 2023 Summer(AtCoder Beginner Contest 312) Announcement. Spoj Solution PRIONPRI - Prime or not Prime! Anton and Letters Solution, Codeforces 71A Way Too Long Words Solution, Codeforces 977A A. Algorithm Design, Data Structures, ACM-ICPC, and IOI, It is my solution to the problems on the codeforces.com site. 2) 219A - k-String Solu Codeforces Round 686 (Div. If I go backwards however, and start with tempCount = 2k-1 and subtract 1, 2, 3, etc., it would take much less time to find the answer. Your task is to write a program that will find the minimum and the maximum number of pairs of friends that could have formed by the end of the competition. UVA 12220 - Divisible Subsequences Solution. A palindrome is a string that reads the same backward as forward, for example strings "z", "aaa", "aba", "abccba" are palindromes, but strings "codeforces", "reality", "ab" are not. It only takes a minute to sign up. It has links to problems on other sites too. I was also getting the same output. Codeforces Round 119 | Solution with Explanation | C++ Code Abhinav Awasthi 8.67K subscribers Join Subscribe 1.3K views 1 year ago PREPERA EDUCATION Subscribe to the channel for Amazing Coding. Mike has a string s consisting of only lowercase English letters. See in link provided in comment. I couldn't find a search field for this anywhere on the site albeit there is one for handles. In other words, during the replacement operation, the first two consecutive periods are replaced by one. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. I was wondering, what is the best way to search problems at Codeforces? {"payload":{"allShortcutsEnabled":false,"fileTree":{"":{"items":[{"name":"01_00Cheatcode-Book.pdf","path":"01_00Cheatcode-Book.pdf","contentType":"file"},{"name . To see all available qualifiers, see our documentation. Virtual contest is a way to take part in past contest, as close as possible to participation on time. GitHub - seikhchilli/codeforces-solution: Codeforces Solutions written in C++ seikhchilli / codeforces-solution Public master 1 branch 0 tags 329 commits 1011A.cpp Stages 2 years ago 1030A.cpp In Search of an Easy Problem 2 years ago 1080B.cpp Margarite and the best present 2 years ago 1097A.cpp Gennady and a Card Game 2 years ago 110A.cpp Solve in C++: #include using namespace std; main() { long long int n,i,a,r,j,f=0; scanf("%lld&quo Codeforces Round 859 (Div. In Search of an Easy Problem solution, Codeforces 443A. Can an LLM be constrained to answer questions only about a specific dataset? codeforces-solutions If you just want to solve some problem from a contest, a virtual contest is not for you - solve this problem in the archive. Heyy can u post the pic of xNumber of any problem, I seem to not get it? Answer (1 of 3): For most of the problems there will be editorial in Codeforces. MathJax reference. Code. For example, if I want to find the "GREEDY" problems which occurred as a "DIV 1 Problem C", how should I search? As per your instruction I went and click on xNumber tried to check the filter on the write, yet I cant see it. Let's define the operation of replacement as the following sequence of steps: find a substring " .. " (two consecutive periods) in string s, of all occurrences of the substring let's choose the first one, and replace this substring with string ". Let's define f(s) as the minimum number of operations of replacement to perform, so that the string does not have any two consecutive periods left. There was a problem preparing your codespace, please try again. Asking for help, clarification, or responding to other answers. 2], I think I just did something crazy? In the above picture you can click on the link named as tutorial to see the editoria. Note to the first sample test (replaced periods are enclosed in square brackets). This repo contains the Detailed Explanation and implementation of Various Coding problems on various platforms in C++. PS: What's the best way to ask questions like this one? Is it unusual for a host country to inform a foreign politician about sensitive topics to be avoid in their speech? Codeforces 1807C - Find and Replace (greedy, implementation, strings, 800) 4) || C. Find and Replace Solution || Samrat. 4) 1807C - Find and Replace Solution, /// La ilaha illellahu muhammadur rasulullah, ///******Bismillahir-Rahmanir-Rahim******///, ///**********ALLAH IS ALMIGHTY************///. Star 105 Code Issues Pull requests Actions master 1 branch 0 tags 469 commits Failed to load latest commit information. While on SO someone posted this question and I gave it a quick try. If nothing happens, download Xcode and try again. With google.com/cse one can easily create a Custom Search Engine for a particular site or a group of sites. Work fast with our official CLI. How to display Latin Modern Math font correctly in Mathematica? Round 889 Question B, Interactive Problems: Guide for Participants, Atcoder problem statement of F Cans and Openers, UNIQUE VISION Programming Contest 2023 Summer(AtCoder Beginner Contest 312) Announcement. The second line contains string s, consisting of n lowercase English letters and period signs. How do I set my home country on Codeforces? My solution passed all the testcases. 2) 1285B - Just Eat It Codeforces Round 653 (Div. The first and single line contains string s (1|s|15). note this is not my coding style it is just for the fast writing in problem-solving contests, Competitive programming is a mind sport usually held over the Internet or a local network, involving participants trying to program according to provided specifications. To see all available qualifiers, see our documentation. Find and replace codeforces solution || Problem C find and replace codeforces solution Input The only line of input contains two integers n and m , separated by a single space ( 1 m n 10 9 ) the number of participants and the number of teams respectively. For example, $$$\texttt{01010101}$$$, $$$\texttt{101}$$$, $$$\texttt{1}$$$ are alternating binary strings, but $$$\texttt{0110}$$$, $$$\texttt{0a0a0}$$$, $$$\texttt{10100}$$$ are not. Solution: 1: Consider the simplest case: the string is palindrome, and the length of string is even. In an operation, you can take a character and replace all occurrences of this character with $$$\texttt{0}$$$ or replace all occurrences of this character with $$$\texttt{1}$$$. Can Henzie blitz cards exiled with Atsushi? topic, visit your repo's landing page and select "manage topics.". Now the string is $$${\texttt{0}}\color{red}{\texttt{1}}{\texttt{0}}\texttt{c}{\texttt{0}}\color{red}{\texttt{1}}{\texttt{0}}$$$. 2) 1806B - Mex Master S Codeforces Round 858 (Div. 2) 1806 C - Sequence M Codeforces Beta Round 99 (Div. For instance, f (abc) = 3, f (bbbbb) = 1, and f (babacaba) = 3. Try to code your own search scripts with Black Jack and possibility to find anything you want :) In fact there's no way to filter resutls by difficulty which problem had on the contest. Find the minimum lexicographically possible string that can be obtained by performing no more than k operations. Problem Link :https://codeforces.com/contest/1807/problem/C. Ok, I found a filter on the status page. I would suggest you have a look at, New! You are given a string $$$s$$$ consisting of lowercase Latin characters. The first line contains an integer $$$t$$$ ($$$1 \leq t \leq 100$$$) the number of test cases. topic page so that developers can more easily learn about it. Problem Link: https://codeforces.com/contest/1807/problem/CSolution Link: https://ideone.com/MA2ijXAlgoBot Official Site: https://algobot048.comJoin AlgoBot . Issues. The first line contains two integers n and m (1n,m300000) the length of the string and the number of queries. What does it mean in terms of energy if power is increasing with time? The only programming contests Web 2.0 platform. I can't think of any problem.. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. The second line of each test case contains a string consisting of $$$n$$$ lowercase Latin characters the string $$$s$$$. If you still didnt find a sastisfactory answer, you are always welcome to ask your friends via message or post a blog. The Rank.cpp 1030 A. I want to do that, so I made a Google Spreadsheet for that. The i-th line contains integer xi and ci (1xin, ci a lowercas English letter or a period sign), describing the query of assigning symbol ci to position xi. Now the string is $$${\texttt{0}}{\texttt{1}}{\texttt{0}}\color{red}{\texttt{1}}{\texttt{0}}{\texttt{1}}{\texttt{0}}$$$. Check it out :). 1 + Div. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright . 1807C - Find and Replace - CodeForces Solution. You can easily go through the editorial link to see the editorial, which is placed at the right bottom corner of the problem page. You switched accounts on another tab or window. Using a comma instead of and when you have a subject with two verbs. Replace $$$\texttt{b}$$$ with $$$\texttt{1}$$$. Posting a blog should be used as a last option. Codeforces Practice Tracker Browser Extension, Educational Codeforces Round 152 Editorial, Educational Codeforces Round 152 [Rated for Div. Solution: First of all, according to the problem description, if the n+1th village is not considered, there will be no problem going from 1 to n. Then we found that all villages from 1 to n have an edge connected to n+1 village, but the direction is uncertain. Also comment down below sharing your thoughts, all constructive criticisms are welcomed.Happy Coding! Never use someone else's code, read the tutorials or communicate with other person during a virtual contest. 2), Codeforces Round 887 (Div 1, Div 2) Tutorial, 2022-2023 Southern And Volga Russian Regional - Editorial. Is it possible to perform some number of moves so that the resulting string is an alternating binary string ? OverflowAI: Where Community & AI Come Together, Codeforces - problem: (A) Mike and palindrome, Behind the scenes with the folks building OverflowAI (Ep. For example, consider the string abacaba abacaba. You switched accounts on another tab or window. Pull requests. {"payload":{"allShortcutsEnabled":false,"fileTree":{"":{"items":[{"name":".idea","path":".idea","contentType":"directory"},{"name":".all-contributorsrc","path":".all . You signed in with another tab or window. If you want to use another filters, then you can copy and edit on your Google Drive. Restoring Three Numbers Solution, Codeforces 1030A A. Atom rev2023.7.27.43548. You should write what you want your code to do and rely on the compiler to handle it correctly. 3) 1324D. You can just find all the "greedy" problems and then sort them by descending number of people who solved them, that's the best way I guess. Thank you everyone for your time and kind reply :). You can just find all the "greedy" problems and then sort them by descending number of people who solved them, that's the best way I guess. Hi, I'm looking for Python submissions on codeforces. 1 + Div. I've added a example filter to find "the Div.1 search problems". Solutions to all the questions I solved during the Competitive programming course with Coding Ninjas. Do subscribe our channel to get more such updates and also like the video if you find it helpful. Output We read every piece of feedback, and take your input very seriously. Print m numbers, one per line, the i-th of these numbers must be equal to the value of f(s) after performing the i-th assignment. 2], I think I just did something crazy? Any decent compiler will generate exactly the same code for, @Ch3steR, thanks, that fixed it. The following m lines contain the descriptions of queries. Codeforces Practice Tracker Browser Extension, Educational Codeforces Round 152 Editorial, Educational Codeforces Round 152 [Rated for Div. Schopenhauer and the 'ability to make decisions' as a metric for free will. Codeforces-Problem-Solution-By-Saurav-Paul, my-problem-solving-solutions-on-codeforces.com. It is supported only ICPC mode for virtual contests. 3) 1800D - Remove Two L Codeforces Round 396 (Div. Hi, you can go to the submissions page of the contest problem by clicking on the x"abcd" on the right of the problem, where "abcd" is a number. Golang | Solutions to Codeforces by Go . By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. This is just personal preferences, but I find the following easier to read with the decleration on seperate lines: With the decleration of length you can replace this line: You can break out of the while loop as soon as cnt is larger than one. codeforces-solutions Algebraically why must a single square root be done on all terms rather than individually? Minimize diameter of tree by applying almost k.operations. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. If you just want to solve some problem from a contest, a virtual contest is not for you - solve this problem in the archive. Input The first and single line contains string s (1 |s| 15). After each operation you have to calculate and output the value of f(s). By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright . The first test case is explained in the statement. I'm clicking through the standings page of a recent contest and most seem to be C or C++. Add a description, image, and links to the There is no way like topcoder ! Replace $$$\texttt{c}$$$ with $$$\texttt{1}$$$. My name is Abul Hasnat Tonmoy.Now i am studing in Islamic university,Bangladesh at Department of Computer Science And Enginnering. So that: Every time, after Alice changed 0 to 1. Adjacent Replacements.cpp Go to file Go to file T; Go to line L; Copy path Copy permalink; This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. http://codeforces.com/problemset/status/796/problem/A. For each test case, output "YES" (without quotes) if you can make the string into an alternating binary string, and "NO" (without quotes) otherwise. Due to the rapidly accumulating user content, a natural question to ask: what is the current idiom of looking for blog posts and comments containing a given query? Codeforces Round 613 (Div. Validating input: You should check if std::cin was successful. If string s contains no two consecutive periods, then nothing happens. Thanks for contributing an answer to Code Review Stack Exchange! Wrong Subtraction Solution. Minimize diameter of tree by applying almost k.operations. 2) 1806A - Walking Mast Codeforces Round 135 (Div. Why would a highly advanced society still engage in extensive agriculture? 594), Stack Overflow at WeAreDevelopers World Congress in Berlin, Palindrome numbers - Project Euler Problem 4, Ruby solution to Project Euler Problem #4: Largest palindrome product, Project Euler - Problem No.4 - Largest palindrome product, Find longest palindrome in a string (LeetCode problem 5), Codeforces #806 Problem D: Double Strings. A way to search for tags is to use the url http://codeforces.com/search?query=yourquery, where yourquery is the tag you're looking for. If you still didnt find a sastisfactory answer, you are always welcome to ask your friends via message or post a blog. Thank you. In Search of an Easy Problem.cpp Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. programming,coding,codeforces,c++,solution,solve,uva,spoj,c,dfs,binary search,number theory,graph,bfs,math,algorithm,lightoj,Competitive Programming And what is a Turbosupercharger? The only programming contests Web 2.0 platform, http://codeforces.com/problemset/tags/greedy, Teams going to ICPC WF 2022 (Egypt 2023) WIP List, Editorial of Codeforces Round 889 (Div. In an operation, you can take a character and replace all occurrences of this character with 0 0 or replace all occurrences of this character with 1 1. 2], I think I just did something crazy? Subscribe to the channel for Amazing Coding and Competitive Programming Content.Problem Link: https://codeforces.com/contest/1620/problem/ECode Link:Join Whatsapp Group: https://chat.whatsapp.com/DcnucLiQlEaFfhdb1TIvLpJoin Discord: https://discord.gg/GbefhExv Join Telegram for Post Contest Discussions, Coding Meets, Important Updates, Join Community of over 1000+ Coders: https://t.me/codenavdiscussFollow Codenav on Instagram: https://instagram.com/code.navJoin My Telegram Channel For Daily Coding Content And Study Resources: https://t.me/codenavWebsite- https://abhinavawasthi.code.blogLinkTree- https://linktr.ee/abhinavawasthiMy LinkedIn- https://www.linkedin.com/in/abhinavawasthi01My Instagram- https://www.instagram.com/iammabhinavMy Facebook- https://www.facebook.com/awasthi.abhinav.3My Twitter- https://twitter.com/call_me_abhinavCoding Blogs- https://abhinavawasthi.code.blog/ Repository of solutions for problems from programming contests and websites, My notebook and solutions for 300+ problems that I solved during practice for ACM-ICPC, Our answers to some programming problems,like ACM ICPC problems and others. If you've seen these problems, a virtual contest is not for you - solve these problems in the archive. 4) | Codeforces | DCC NIT-A - YouTube Codeforces Round 859 (Div. Daniel has a string s, consisting of lowercase English letters and period signs (characters '.'). cp-tool is an auto generator for solved problems at different online judges. Codeforces-Solution / 1006 A. It displays "Any Language" Initially. use "select" statement and inner and outer joins ;), Try to code your own search scripts with Black Jack and possibility to find anything you want :). http://www.google.com/cse/home?cx=000550900255310980985:d7xrw0qiecm. Solve more problems and we will show you more here! Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Today, I'm sharing it. 2), Codeforces Round 887 (Div 1, Div 2) Tutorial, 2022-2023 Southern And Volga Russian Regional - Editorial. 2) 139A - Petr and Codeforces Round 858 (Div. For example, consider the string $$$\texttt{abacaba}$$$. Try this link, I use it my self. 4) 1807C - Find and Re Codeforces Round 627 (Div. ". Codeforces should add this features . How can I change elements in a matrix to a combination of other elements? ( sign in Link to the problem: Problem: (A) Mike and palindrome. Problem Statement : Let us define the f (x) function for a string x as the number of distinct characters contained in the string. Please What is Mathematica's equivalent to Maple's collect with distributed option? This is an alternating binary string. This repository contains the solutions to CodeForces competitions. 1 A. Theatre Square.cpp 1003 A. Polycarp's Pockets.cpp 1005 A. Tanya and Stairways.cpp 1005 B. Delete from the Left.cpp 1006 A. (All problems are available on http://uva.onlinejudge.org or https://open.kattis.com) ** PLEASE STAR THE REPO IF IT 'S USEFUL :) **. 4) || C. Find and Replace Solution || Samrat Bhattacharya (CSE'26)Problem : https://codeforces.com/contest/1807/problem/CSolution : https://codeforces.com/contest/1807/submission/198227363We highly recommend you to go through the question once, try to solve it by yourself and in case you get stuck revert back to this video for detailed explanation and solution to the problem.Welcome to NIT Agartalas Developers \u0026 Coders Club channel. Use MathJax to format equations. Use Git or checkout with SVN using the web URL. Pair of Topic Codeforces Round 858 (Div. It is always good if you can split out complexities into functions. Whether you use length & 1 or length % 2 is entirely up to you but one thing you lose with & 1 is the intention. The correct answer is 2527130128540. Or if you really need, for example, only "C" problems, check them by yourself looking through every problem. The description of the test cases follows. to use Codespaces. 2) 1365C - Rotation Ma Codeforces Round 859 (Div. To associate your repository with the Competitive programming is a mind sport usually held over the Internet or a local network, involving participants trying to program according to provided specifications. Can I search for solutions in a particular language on the standings page? The best answers are voted up and rise to the top, Not the answer you're looking for? Solution Click Below:- CLICK HERE And you are given the integer k the maximum number of operations that can be performed. In fact there's no way to filter resutls by difficulty which problem had on the contest. The video is uploaded in the YouTube channel of Developers and Coders Club NIT-ADevelopers and You can output the answer in any case (for example, the strings "yEs", "yes", "Yes" and "YES" will be recognized as a positive answer). 2), Codeforces Round 887 (Div 1, Div 2) Tutorial, 2022-2023 Southern And Volga Russian Regional - Editorial. The challenges can be found at www.codeforces.com. 1 + Div. If you've seen these problems, a virtual contest is not for you - solve these problems in the archive. I hope it helps you in general. VDOMDHTMLtml> C. Find and Replace | Codeforces Round 859 (Div. The site is, however, searchable in Google, but it isn't nearly as convenient as a built-in solution would be. Code Review Stack Exchange is a question and answer site for peer programmer code reviews. If nothing happens, download GitHub Desktop and try again. Minimize diameter of tree by applying almost k.operations. I couldn't find a search field for this anywhere on the site albeit there is one for handles. 3) 1374D - Zero Remaind Codeforces Round 648 (Div. How do I set my home country on Codeforces. You need to process m queries, the i-th results in that the character at position xi (1xin) of string s is assigned value ci. The only programming contests Web 2.0 platform, Teams going to ICPC WF 2022 (Egypt 2023) WIP List, Editorial of Codeforces Round 889 (Div. Codeforces Practice Tracker Browser Extension, Educational Codeforces Round 152 Editorial, Educational Codeforces Round 152 [Rated for Div. For this case, Bob must win. He wants to change exactly one character from the string so that the resulting one is a palindrome. Is it possible to perform some number of moves so that the resulting string is an alternating binary string$$$^{\dagger}$$$? The only programming contests Web 2.0 platform, Teams going to ICPC WF 2022 (Egypt 2023) WIP List, Editorial of Codeforces Round 889 (Div. The best way to ask these questions is to google them first. Click on that and select language of your choice. The problem statement has recently been changed. It is supported only ICPC mode for virtual contests. The best way to ask these questions is to google them first. Why do code answers tend to be given in Python when no language is specified in the prompt? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Let's define the operation of replacement as the following sequence of steps: find a substring ".." (two consecutive periods) in string s, of all occurrences of the substring let's choose the first one, and replace this substring with string ".".

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