Problem - 335b - Codeforces Find minimum number of operations to make a string palindrome. If s contains a palindrome of length exactly 100 as a subsequence, print any palindrome of length 100 which is a subsequence of s. If s doesn't contain any palindromes of length exactly 100, print a palindrome that is a subsequence of s and is as long as possible. Update mike-and-palindrome.cpp. For example, "01001" becomes "10010" after reversing. The problem is to determine whether a number 1<=N<=10^9 can be a numeric polyndrome. Here are some examples of good strings: This also forces Bob to use the $$$1$$$-st operation. It is guaranteed that $$$s$$$ is a palindrome. 3)https://codeforces.com/contest/1512We host the virtuals almost every day, to participate in the. For me it was quite obvious that what he meant was "I am only wondering if such post has been made by green or grey" xdd. If you just want to solve some problem from a contest, a virtual contest is not for you - solve this problem in the archive. Profect. Mike has a string s consisting of only lowercase English letters. If both players play optimally, output whether Alice wins, Bob wins, or if it is a draw. You goal is to obtain a string with the maximum possible value of palindromic count. The string "uffuw" is one of the longest non-palindrome substrings (of length $$$5$$$) of the string "wuffuw", so the answer for the second example is $$$5$$$. Codeforces Short story about palindromes. Input The first and single line contains string s (1 |s| 15). He doesn't like palindromes, so he changed Naviek to Navick. See operations below: A:100000; B:100001; A:110001; B:110011; A:111011; B: reverse; A: 111111. 1 Answer 2 4.1k views written 5.6 years ago by teamques10 55k Sample strings for palindromes: abba baab bbbb aaaa So, our CFG has to provide a looping condition such that the palindrome is constructed S =>abSBA|baSAB| A =>a B =>b We break this grammar even more to simplify it further Maximum Product of Word Lengths(Bitmask&dp).cpp","path":"318. 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. Otherwise print $$$0$$$. Problem - 691B - Codeforces But "aba" is a palindrome, so "aab" is the only correct answer. 5. 4) Editorial TheScrasse Codeforces Round 889 (Div. Problem - 1682A - Codeforces In the third test case, "zaza" and "zzaa" are correct answers, but not "azza". A substring $$$s[l \ldots r]$$$ ($$$1\leql\leqr\leq|s|$$$) of a string $$$s=s_{1}s_{2} \ldots s_{|s|}$$$ is the string $$$s_{l}s_{l+1} \ldots s_{r}$$$. You can arbitrarily rearrange its characters. Solution for input type 1 is easy. Virtual contest is a way to take part in past contest, as close as possible to participation on time. Up to this day I am wondering how some people apparently understood what he meant even though he dropped whole "what would happen" in the middle of this sentence. C. A-B Palindrome | Codeforces Round #713 - YouTube Namely, each word $$$s$$$ is changed into its longest substring that is not a palindrome. Don't tell anybody, but I've heard that it's also possible to calculate the length of the longest border of each prefix of the string in a linear time :o. Never use someone else's code, read the tutorials or communicate with other person during a virtual contest. The string is case-sensitive. For each test case, if there is no solution, output "NO". {"payload":{"allShortcutsEnabled":false,"fileTree":{"":{"items":[{"name":"codeforces_EvenOddGame.cpp","path":"codeforces_EvenOddGame.cpp","contentType":"file"},{"name . A palindrome is a string that reads the same backward as forward. Print exchange order and swap count to make count of 1s same rowwise in Binary Matrix. The first line of each test case contains a single integer $$$n$$$ ($$$1 \le n \le 10^3$$$). Make a string a palindrome in the minimum number of operations - Codeforces If you've seen these problems, a virtual contest is not for you - solve these problems in the archive. in the $$$2$$$-nd move Bob reverses the string. Reverse the whole string, pay 0 dollars. Then $$$t$$$ test cases follow. GitHub: Let's build from here GitHub The problem statement has recently been changed. 3. It is possible to solve this problem with the eertree or with Manacher's algorithm with some data structures, but I will describe a simpler way. Problem - 1555D - Codeforces Can someone find what is the problem in my code? Codeforces Round 887 (Div 2)A~C - - The string "aa" is not "s-palindrome", because the second half of it is not a mirror reflection of the first half. GitHub - kantuni/Codeforces: Solutions to Codeforces Problems A subsequence of a string is a string that can be derived from it by deleting some characters without changing the order of the remaining characters. standard input. The player who spends minimum dollars till this point wins the game and it is a draw if both spend equal dollars. in the $$$1$$$-st move, Alice will use the $$$2$$$-nd operation to reverse the string, since doing the $$$1$$$-st operation will result in her loss anyway. For example, " abaaba " has degree equals to 3. If we remove s1 s 1 from s s, the string becomes " ba " which is not a palindrome. She also changes all the words she reads in a similar way. The package for this problem was not updated by the problem writer or Codeforces administration after we've upgraded the judging servers. Otherwise, output "YES" followed by your constructed string of length $$$|s|+1$$$ on the next line. You hate palindromes because they give you dj vu. The problem statement has recently been changed. image-20230724035013410. Contribute to kantuni/Codeforces development by creating an account on GitHub. You have to count the number of indices $$$i$$$ $$$(1 \le i \le n)$$$ such that the string after removing $$$s_i$$$ from $$$s$$$ still remains a palindrome. The problem statement has recently been changed. Automata Theory | Set 5 - GeeksforGeeks The first line contains a single integer $$$t$$$ ($$$1 \le t \le 10^3$$$). . Seems simple and resembles prefix-function, right? 2), which will start on Jul/29/2023 17:35 (Moscow time). In the beginning of the new year Keivan decided to reverse his name. The problem statement has recently been changed. Given a number, find the next smallest palindrome The only programming contests Web 2.0 platform, Choose any $$$i$$$ ($$$1 \le i \le n$$$), where $$$s[i] =$$$ ', Reverse the whole string, pay 0 dollars. there is a man, named palindrome. If there exists multiple answers, you are allowed to print any of them. 1, by Moscow Team Olympiad). For example, the strings " z ", " aaa ", " aba ", and " abccba " are palindromes, but " codeforces " and " ab " are not. 1 |s| 106 1 | s | 10 6. string , palindrome , constructive. Solution: 1: Consider the simplest case: the string is palindrome, and the length of string is even. Update mike-and-strings.cpp. Let's define a palindromic count of the string as the number of its substrings that are palindromes. A palindrome is a string that reads the same backward as forward. This way, there are no non-palindrome substrings. The second line of each test case contains a string $$$s$$$ consisting of lowercase English letters. Never use someone else's code, read the tutorials or communicate with other person during a virtual contest. in the $$$3$$$-rd move Alice again has to perform the $$$1$$$-st operation. Print "YES" (without quotes) if Mike can change exactly one character so that the resulting string is palindrome or "NO" (without quotes) otherwise. If you've seen these problems, a virtual contest is not for you - solve these problems in the archive. You are given a positive integer n n. Let's call some positive integer a a without leading zeroes palindromic if it remains the same after reversing the order of its digits. standard output. The second line of each test case contains the string $$$s$$$ of length $$$n$$$, consisting of the characters '0' and '1'. B. Update Files. The only programming contests Web 2.0 platform. But would a green or grey posting this really make a difference. If it is possible to create a string that is not a palindrome, you should find one example. D. Red-Blue Matrix. The only difference between the easy and hard versions is that the given string $$$s$$$ in the easy version is initially a palindrome, this condition is not always true for the hard version. It is supported only ICPC mode for virtual contests. The only programming contests Web 2.0 platform. This is the Video Editorial for Codeforces Round #713 (Div. {"payload":{"allShortcutsEnabled":false,"fileTree":{"":{"items":[{"name":"318. Shedding some more light implying that post this referred to was so low quality it must have been authored by either green or grey but author of this comment doesn't know which is the case (meant of course as humorous mocking the author), Right! Need help in Longest Palindrome (CSES) using Manchers - Codeforces If there is such a substring in $$$s$$$ that is not a palindrome, print the maximum length of such a substring. You will be given 6 problems and 2 hours and 30 minutes to solve them in both divisions. You are given a string s s, and for each r r you need to find the largest Lr L r, such that s[r Lr + 1 r] s [ r L r + 1 r] is a palindrome. For example, consider s s = " aba ". On one hand I understand your point, on the other I seriously doubt this is "further simplifying" with some suffix-links and shit and I think version from blog is really simple to understand and remember and has some value in itself as such. Write a program that uses a recursive method to check whether a string is a palindrome. The easiest such black box is a polynomial hash, but also you can precalculate stuff from Manacher's algorithm and then check that $$$\frac{(l+r)}{2}$$$ is a middle of a long enough palindrome. Solve more problems and we will show you more here! Solved (C++) A palindrome is a string that reads the same - Chegg A-B Palindrome | Problem C | Codeforces Round - YouTube Output Print " TAK " if the string s is " s-palindrome " and " NIE " otherwise. In the fifth test case, we can only make "aa", which is a palindrome. Starting from $$$L_i = L_{i-1}+2$$$, decrease $$$L_i$$$ while $$$s[i - L_i + 1 \ldots i]$$$ is not a palindrome. Note that there is no limit on the sum of $$$n$$$ over test cases. In each turn, the player can perform one of the following operations: Choose any i i ( 1 i n 1 i n ), where s[i] = s [ i] = ' 0 ' and change s[i] s [ i] to ' 1 '. Short story about palindromes - Codeforces In the second test case, we can make either "aab" or "aba". Ciao, Codeforces! To adjust the time limit constraint, a solution execution time will be multiplied by 2. Solutions to Codeforces Problems. If you've seen these problems, a virtual contest is not for you - solve these problems in the archive. A. AB Balance. Problem - 1238D - Codeforces It is optimal and sufficient to make changes to characters in any one of half of the string. You are given a palindromic string $$$s$$$ of length $$$n$$$. Maybe, but polynomial hashes should be enough. Problem - 798A - Codeforces The first test case is described in the statement. You are given a palindromic string s s of length n n. You have to count the number of indices i i (1 i n) ( 1 i n) such that the string after removing si s i from s s still remains a palindrome. It is supported only ICPC mode for virtual contests. For example, "abba", "a", "fef" are palindromes whereas "codeforces", "acd", "xy" are not. Javascript #include <bits/stdc++.h> using namespace std; bool isPossiblePalindrome (string str) { int n = str.length (); for (int i=0; i<n/2; i++) { dot and they are not equal also, then it is not possible to make this string a palindrome */ if (str [i] != '.' && str [n-i-1] != '.' && str [i] != str [n-i-1]) return false; } The problem statement has recently been changed. All substrings of the string " qqqqqqqq " consist of equal characters so they are palindromes. Lets choose the first half. Like, what else could he possibly have meant? The only line of each test case contains a string $$$s$$$ consisting of lowercase English letters. CodeForces | A-B Palindrome - StopStalk Virtual contest is a way to take part in past contest, as close as possible to participation on time. Never use someone else's code, read the tutorials or communicate with other person during a virtual contest. No way! He is too selfish, so for a given n he wants to obtain a string of n characters, each of which is either ' a ', ' b ' or ' c . If you just want to solve some problem from a contest, a virtual contest is not for you - solve this problem in the archive. A non-empty string is called palindrome, if it reads the same from the left to the right and from the right to the left. If it is possible, or a number is polyndrome, the result must be yes, otehrwise no. So the answer is "NO". A-B Palindrome | Codeforces Round #713 | GREEDY | CODE EXPALAINER | CODEFORCES code Explainer 14.3K subscribers Subscribe 2.1K views 2 years ago codeforces solution Question Link :. How to convert a given number to a greater palindrome? There is a string $$$s$$$. For example, "101101" is a palindrome, while "0101" is not. numeric palindrome with leading zeros c++ - Stack Overflow 2), [Tutorial] Floors, ceilings and inequalities for beginners (with some programming tips), Educational Codeforces Round 152 Editorial, How to use Centroid Decomposition to solve IOI 2011 RACE, Invitation to SmallForces Monthly Contest #3, Teams going to ICPC WF 2023 (Egypt 2023, 2nd final) WIP List, Atcoder problem statement of F Cans and Openers, How do I get blue in codeforces in 1 month, How to solve http://www.spoj.com/problems/SUMMUL/, Educational Codeforces Round 144 Editorial, UNIQUE VISION Programming Contest 2023 Summer(AtCoder Beginner Contest 312) Announcement, 1569C - Jury Meeting: Not able to calculate n! Do you think I may use prefix function as a black box here? For example, "abc", "ab", and "c" are substrings of the string "abc", while "ac" and "d" are not. A palindrome is a string that reads the same backward as forward. Virtual contest is a way to take part in past contest, as close as possible to participation on time. 1) and Codeforces Round 889 (Div. The first line contains a non-empty string $$$s$$$ with length at most $$$50$$$ characters, containing lowercase English letters only. Virtual contest is a way to take part in past contest, as close as possible to participation on time. GitHub: Let's build from here GitHub Minimum characters to be added at front to make string palindrome. The only programming contests Web 2.0 platform, Codeforces Round 516 (Div. Write a class Pstring that is derived from the STL string class. The game ends when every character of string becomes '1'. The problem statement has recently been changed. The first line of the input contains a single integer $$$t$$$ $$$(1 \leq t \leq 10^3)$$$ the number of test cases. Your program must contain a value-returning recursive method that returns true if the string is a palindrome and false otherwise. Let's define a palindromic count of the string as the number of its substrings that are palindromes. The first line contains a single integer $$$t$$$ ($$$1\le t\le 10^4$$$) the number of test cases. 1 + Div. The only programming contests Web 2.0 platform. It is possible to solve this problem with the eertree or with Manacher's algorithm with some data structures, but I will describe a simpler way. Let's assume that you already know $$$L_1, L_2, \ldots, L_{i-1}$$$ and we want to calculate $$$L_i$$$. For example, the strings "z", "aaa", "aba", and "abccba" are palindromes, but "codeforces" and "ab" are not. Thus, the answer for the first example is $$$3$$$. Codeforces Round #721 Palindrome Game (easy/hard) Solution (Java/C++) Computer Science Computer Science questions and answers (C++) A palindrome is a string that reads the same backward as forward. What is the word she changed it into? Virtual contest is a way to take part in past contest, as close as possible to participation on time. I have been stuck for 4 hours :') https://codeforces.com/contest/1512/submission/113090145, According to your code output is -1 where as you can form 10000011000001, The only programming contests Web 2.0 platform, Editorial of Codeforces Round 889 (Div. Update fake-np.cpp. If you just want to solve some problem from a contest, a virtual contest is not for you - solve this problem in the archive. Problem - 805b - Codeforces The only line contains the string s (1|s|1000) which consists of only English letters. If you just want to solve some problem from a contest, a virtual contest is not for you - solve this problem in the archive. If there are multiple solutions, you may print any. For each test case, output a single integer the number of indices $$$i$$$ $$$(1 \le i \le n)$$$ such that the string after removing $$$s_i$$$ from $$$s$$$ still remains a palindrome. Codeforces 798A - Mike and palindrome - Programmer All 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. To adjust the time limit constraint, a solution execution time will be multiplied by 2. The first test case is described in the statement. The first and single line contains string s (1|s|15). Codeforces - problem: (A) Mike and palindrome - Code Review Stack Exchange Shortest Palindrome Manacher's Algorithm Find String Roots . For example, if your solution works for 400 ms on judging servers, then the value 800 ms will be displayed and used to determine the verdict. Recall that a palindrome is a string that reads the same way from the first character to the last and from the last character to the first. AtCoder ABC 175 Problem F Making Palindrome Solution. [translation] Give you a string with a length not exceeding 5000 and ask how many palindrome substrings of order KK are there respectively. input. It is guaranteed that the string $$$s$$$ contains at least one '0'. - (n!/(k+1). 1 + Div. A string is called a substring of another string, if it can be obtained from that string by dropping some (possibly zero) number of characters from the beginning and from the end of it. You are given a string s. Check if the string is "s-palindrome". PepCoding | Ab-string Hence the answer is $$$4$$$. Problem - 1063A - Codeforces He wants to change exactly one character from the string so that the resulting one is a palindrome. "mew" is not a palindrome, so the longest substring of it that is not a palindrome, is the string "mew" itself. in the $$$2$$$-nd move, Bob has to perform the $$$1$$$-st operation, since the $$$2$$$-nd operation cannot be performed twice in a row. English alphabet You are given a string s. Check if the string is " s-palindrome ". How to write palindrome in JavaScript - Stack Overflow For example, the strings "kek", "abacaba", "r" and "papicipap" are palindromes, while the strings "abb" and "iq" are not. The only programming contests Web 2.0 platform, MemSQL start[c]up Round 2 - online version. 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. The problem statement has recently been changed. standard output. All characters of the string are '. output. E. Arena. Note, that even though some substrings coincide, they are counted as many times as they appear in the resulting string. A palindrome is a string that reads the same backward as forward. If you've seen these problems, a virtual contest is not for you - solve these problems in the archive. This operation is only allowed if the string is currently not a palindrome, and the last operation was not reverse. abcdbb2345 aba1b6a2b8bcabb6,8,10 . Answer (B) Contribute to kantuni/Codeforces development by creating an account on GitHub. Maybe nik7 had a point about the escape room post (though I'd say it is arguable, I'd say the comment is kinda irrelevant). Input The first and single line contains string s ( 1 |s| 15 ). For example, the string "oHo" is "s-palindrome", but the string "aa" is not. This is the worst story I have ever heard. C. Palindrome Basis. If you've seen these problems, a virtual contest is not for you - solve these problems in the archive. For each test case print a single word in a new line: Virtual contest is a way to take part in past contest, as close as possible to participation on time. Case 1: p is in first half of the string. codeforces round#427D Palindromic characteristics Output For this case, Bob must win. in the $$$1$$$-st move Alice has to perform the $$$1$$$-st operation, since the string is currently a palindrome. If all the substrings of $$$s$$$ are palindromes, she skips the word at all. If you just want to solve some problem from a contest, a virtual contest is not for you - solve this problem in the archive. If you just want to solve some problem from a contest, a virtual contest is not for you - solve this problem in the archive. You are given a string $$$s$$$. If you've seen these problems, a virtual contest is not for you - solve these problems in the archive.
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