考虑A中第i次出现的j字符,最终位置一定是在B中第i次出现的j字符的位置,然后即求逆序对数量,cdq/线段树即可 1 #include<bits/stdc++.h> 2 using namespace std; 3 #define N 1000005 4 #define L (k<<1) 5 #define R (L+1) 6 #define mid (l+r>>1) 7 int n,a[N],c[N],nex[N],f[N<<2]; 8 long long…
按照顺序依次找到b串每个字母最后的位置,然后求逆序对. #include<cstdio> #define N 1000010 int n,i,j,k,g[26],nxt[N],bit[N];char a[N],b[N];long long ans; int main(){ for(scanf("%d",&n),gets(a),gets(a+1),gets(b+1),i=1;i<=n;g[a[i]]=i++)nxt[i]=g[a[i]-='A']; for(i=…
又是一道树状数组求逆序对的题目. 这一题我们可以将第二个串中的每一个字母,与第一个串中的字母做两两匹配,令第二个串第i个字母的值id[i]为该字母与第一个串中的字母匹配到的位置. 然后考虑到所求答案为最小的移动次数,那么这个最小的移动次数显然为序列id的逆序对个数. 树状数组求一求就没了. 我一看时间只剩15min了本来想看下能否打完的,没想到3min打完了.... #include<bits/stdc++.h> #define M 2000005 #define L long long #d…
处理数组A,A[i]表示字符串a的第i个字符排序后应去的位置,队列可. 对于多次出现的字符,其在a中的顺序和在b中的顺序应该是一一对应的. #include<cstdio> #include<queue> using namespace std; #define N 1000001 typedef long long ll; queue<int>qs[26]; ll ans; int n,A[N]; char a[N],b[N]; int d[N]; void Upda…
Given a string which contains only lowercase letters, remove duplicate letters so that every letter appear once and only once. You must make sure your result is the smallest in lexicographical order among all possible results. Example: Given "bcabc&q…
Given a string which contains only lowercase letters, remove duplicate letters so that every letter appear once and only once. You must make sure your result is the smallest in lexicographical order among all possible results. Example: Given "bcabc&q…
Remove Duplicate Letters I Given a string which contains only lowercase letters, remove duplicate letters so that every letter appear once and only once. Example: Given "bcabc"Return "abc" Given "cbacdcbc"Return "abcd&qu…
18.13 Given a list of millions of words, design an algorithm to create the largest possible rectangle of letters such that every row forms a word (reading left to right) and every column forms a word (reading top to bottom). The words need not be cho…
原题链接在这里:https://leetcode.com/problems/remove-duplicate-letters/ 题目: Given a string which contains only lowercase letters, remove duplicate letters so that every letter appear once and only once. You must make sure your result is the smallest in lexic…
Given a string which contains only letters. Sort it by lower case first and upper case second. Note It's not necessary to keep the original order of lower-case letters and upper case letters. Example For "abAcD", a reasonable answer is "acb…
Description: Your task is simply to count the total number of lowercase letters in a string. Examples LowercaseCountCheck("abc") == 3 LowercaseCountCheck("abcABC123") == 3 LowercaseCountCheck("abcABC123!@€£#$%^&*()_-+=}{[]|\':…
https://leetcode.com/problems/remove-duplicate-letters/ Given a string which contains only lowercase letters, remove duplicate letters so that every letter appear once and only once. You must make sure your result is the smallest in lexicographical o…
A. Anton and Letters time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Recently, Anton has found a set. The set consists of small English letters. Anton carefully wrote out all the letters f…
316. Remove Duplicate Letters Total Accepted: 2367 Total Submissions: 12388 Difficulty: Medium Given a string which contains only lowercase letters, remove duplicate letters so that every letter appear once and only once. You must make sure your resu…
time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Recently, Anton has found a set. The set consists of small English letters. Anton carefully wrote out all the letters from the set in one li…
A. Letters Cyclic Shift time limit per test:1 second memory limit per test:256 megabytes input:standard input output:standard output You are given a non-empty string s consisting of lowercase English letters. You have to pick exactly one non-empty su…
B. Polycarp and Letters time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Polycarp loves lowercase letters and dislikes uppercase ones. Once he got a string s consisting only of lowercase an…
Description Polycarp loves lowercase letters and dislikes uppercase ones. Once he got a string s consisting only of lowercase and uppercase Latin letters. Let A be a set of positions in the string. Let's call it pretty if following conditions are met…
Description Petya has a string of length n consisting of small and large English letters and digits. He performs m operations. Each operation is described with two integers l and r and a character c: Petya removes from the string all characters c on…
We have a string S of lowercase letters, and an integer array shifts. Call the shift of a letter, the next letter in the alphabet, (wrapping around so that 'z' becomes 'a'). For example, shift('a') = 'b', shift('t') = 'u', and shift('z') = 'a'. Now f…
Given a string which contains only lowercase letters, remove duplicate letters so that every letter appear once and only once. You must make sure your result is the smallest in lexicographical order among all possible results. Example 1: Input: "bcab…
We have a string S of lowercase letters, and an integer array shifts. Call the shift of a letter, the next letter in the alphabet, (wrapping around so that 'z' becomes 'a'). For example, shift('a') = 'b', shift('t') = 'u', and shift('z') = 'a'. Now f…
