Content 给定一个长度为 \(n\) 的仅含小写字母的字符串,执行 \(k\) 次如下操作: 如果字符串中有 a 这个字母,删除从左往右第一个 a,并结束操作,否则继续操作: 如果字符串中有 b 这个字母,删除从左往右第一个 b,并结束操作,否则继续操作: 以此类推,如果所有字母都按照如上方式删除完了,那么结束操作. 现在请你求出操作后的字符串. 数据范围:\(1\leqslant n,k\leqslant 4\times 10^5\). Solution 直接从左往右扫过去,按照上面的方…

Alphabetic Removals time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output You are given a string ss consisting of nn lowercase Latin letters. Polycarp wants to remove exactly kk characters (k≤nk…

C. Alphabetic Removals time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output You are given a string ss consisting of nn lowercase Latin letters. Polycarp wants to remove exactly kk characters (k…

C - Alphabetic Removals ≤k≤n≤4⋅105) - the length of the string and the number of letters Polycarp will remove. The second line contains the string s consisting of n lowercase Latin letters. Output Print the string that will be obtained from s after P…

题目链接: You are given a string ss consisting of nn lowercase Latin letters. Polycarp wants to remove exactly kk characters (k≤nk≤n) from the string ss. Polycarp uses the following algorithm kk times: if there is at least one letter 'a', remove the left…

You are given a string ss consisting of nn lowercase Latin letters. Polycarp wants to remove exactly kk characters (k≤nk≤n) from the string ss. Polycarp uses the following algorithm kk times: if there is at least one letter 'a', remove the leftmost o…

C. Alphabetic Removals time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output You are given a string ss consisting of nn lowercase Latin letters. Polycarp wants to remove exactly kk characters (k…

每个标题都做了题目原网址的超链接 Day21<Alphabetic Removals> 题意: 给定一个字符串,要求按照字典序按照出现的前后顺序删除 k 个字母 题解: 记录字符串中各个字母出现次数 删去字典序下前 k 个 代码注释会比较清楚,题解可能讲的有点模糊了 上板子: #include<bits/stdc++.h> using namespace std; typedef long long ll; int num[26] = { 0 }; int main() { int…

题目: Given two words (start and end), and a dictionary, find all shortest transformation sequence(s) from start to end, such that: Only one letter can be changed at a time Each intermediate word must exist in the dictionary For example, Given: start =…

题目: Given two words (start and end), and a dictionary, find the length of shortest transformation sequence from start to end, such that: Only one letter can be changed at a time Each intermediate word must exist in the dictionary For example, Given:…