Regular Bracket Sequence# time limit per test:1 second memory limit per test:256 megabytes input:standard input output:standard output A string is called bracket sequence if it does not contain any characters o
One day Johnny got bracket sequence. He decided to remove some of the brackets from it in order to obtain a regular bracket sequence. What is the maximum length of a regular bracket sequence which can be obtained? Input consists of a single line with non-empty string of «(» and ...
CodeForces - 5C Longest Regular Bracket Sequence(栈、思维) CF5C Longest Regular Bracket Sequence 题目大意: 给出一个括号序列,求出最长合法子串和它的数量。 合法的定义:这个序列中左右括号匹配 思路: 建立一个数组ArrayArray对应字符串的每一位。 每次遇到左括号把其压入栈中,每次遇到右括号将其和与其匹配的...
In this blog(https://codeforces.com/blog/entry/87585) you can find number of bracket sequences with lenght 2n with a prefix on k open brackets. I belive(if i didnt missunderstand)your problem reduces to the number with a prefix of k minus the number with a prefix of k+1.(The first...
Can someone help please? How can we efficiently count the number of regular bracket sequences with length 2n2n that have first closing bracket on position k+1k+1 (any way faster than O(nk)O(nk) or O(n2))O(n2))?Compare Revisions History ...
Let's define a regular bracket sequence (RBS). Empty string is RBS. Lets1ands2be a RBS then the strings<s1>s2,{s1}s2,[s1]s2,(s1)s2are also RBS. For example the string "[[(){}]<>]" is RBS, but the strings "[)()" and "][()()" are not. ...
Codeforces-612C-Replace To Make Regular Bracket Sequence 【stack】,C.ReplaceToMakeRegularBraYouaregivenstring
Breadcrumbs CodeForces / 1469A-RegularBracketSequence.cpp Latest commit DionysiosB Create 1469A-RegularBracketSequence.cpp 0ce310c· Dec 29, 2020 HistoryHistory File metadata and controls Code Blame 12 lines (8 loc) · 211 Bytes Raw #include <iostream> int main(){ long t; std::cin >> t;...
19 int main(void) //Codeforces Beta Round #5 C. Longest Regular Bracket Sequence 20 { 21 // freopen ("", "r", stdin); 22 23 while (scanf ("%s", s) == 1) 24 { 25 while (!S.empty ()) S.pop (); 26 memset (len, 0, sizeof (len)); ...
This is yet another problem dealing with regular bracket sequences. We should remind you that a bracket sequence is called regular, if by inserting «+» and «1» into it we can get a correct mathematical expression. For example, sequences «(())()», «()» and «((...