题目描述 给出一个roe×col的大写字母矩阵,一开始的位置为左上角,你可以向上下左右四个方向移动,并且不能移向曾经经过的字母.问最多可以经过几个字母. 输入 第一行,输入字母矩阵行数R和列数S,1≤R,S≤20. 接着输出R行S列字母矩阵. 输出 最多能走过的不同字母的个数. 输入样例 3 6 HFDFFB AJHGDH DGAGEH 输出样例 6 思路 一道简单的搜索回溯题目 我们可以定义几个数组,和最大值maxn,输入之后进行搜索,一次一次搜,如果当前进行的步骤比maxn大,就把step(…

1212:LETTERS [题目描述] 给出一个roe×colroe×col的大写字母矩阵,一开始的位置为左上角,你可以向上下左右四个方向移动,并且不能移向曾经经过的字母.问最多可以经过几个字母. [输入] 第一行,输入字母矩阵行数RR和列数SS,1≤R,S≤201≤R,S≤20. 接着输出RR行SS列字母矩阵. [输出] 最多能走过的不同字母的个数. [输入样例] 3 6 HFDFFB AJHGDH DGAGEH [输出样例] 6 错误原因: 把控制4个方向的数组dx,dy里的值赋值时,把0,…

1212: [HNOI2004]L语言 Time Limit: 10 Sec  Memory Limit: 162 MBSubmit: 1367  Solved: 598[Submit][Status][Discuss] Description 标点符号的出现晚于文字的出现,所以以前的语言都是没有标点的.现在你要处理的就是一段没有标点的文章. 一段文章T是由若干小写字母构成.一个单词W也是由若干小写字母构成.一个字典D是若干个单词的集合. 我们称一段文章T在某个字典D下是可以被理解的,是指如果文…

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…

题目链接: C. Letters Cyclic Shift 题意: 现在一串小写的英文字符,每个字符可以变成它前边的字符即b-a,c-a,a-z这样,选一个字串变换,使得得到的字符串字典序最小; 思路: 贪心,尽量让前边的字典序变小; AC代码: #include <iostream> #include <cstdio> #include <cstring> #include <algorithm> #include <cmath> #inclu…

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…