The Smallest String Concatenation 题目链接:http://codeforces.com/problemset/problem/632/C ——每天在线,欢迎留言谈论. 题目大意: 给你n个字符串,相加后 字典序最小 思路: 只需要保证每个相邻的两个字符串组合后 s1+s2>s2+s1 即可. 用sort()快速排序,最后依次输出即可! AC代码: #include <iostream> #include <string> #include &…

Description You're given a list of n strings a1, a2, ..., an. You'd like to concatenate them together in some order such that the resulting string would be lexicographically smallest. Given the list of strings, output the lexicographically smallest c…

题目链接 给出n个字符串, 将他们连在一起, 求连玩之后字典序最小的那种情况. 按a+b<b+a排序.... #include <iostream> #include <vector> #include <cstdio> #include <cstring> #include <algorithm> #include <cmath> #include <map> #include <set> #inclu…

C. The Smallest String Concatenation time limit per test 3 seconds memory limit per test 256 megabytes input standard input output standard output You're given a list of n strings a1, a2, ..., an. You'd like to concatenate them together in some order…

C. The Smallest String Concatenation 题目连接: http://www.codeforces.com/contest/632/problem/C Description You're given a list of n strings a1, a2, ..., an. You'd like to concatenate them together in some order such that the resulting string would be lex…

题目链接:http://codeforces.com/problemset/problem/632/C C. The Smallest String Concatenation time limit per test 3 seconds memory limit per test 256 megabytes input standard input output standard output You're given a list of n strings a1, a2, ..., an. Y…

You're given a list of n strings a1, a2, ..., an. You'd like to concatenate them together in some order such that the resulting string would be lexicographically smallest. Given the list of strings, output the lexicographically smallest concatenation…

C. The Smallest String Concatenation time limit per test 3 seconds memory limit per test 256 megabytes input standard input output standard output You're given a list of n strings a1, a2, ..., an. You'd like to concatenate them together in some order…

C. The Smallest String Concatenation time limit per test 3 seconds memory limit per test 256 megabytes input standard input output standard output You're given a list of n strings a1, a2, ..., an. You'd like to concatenate them together in some order…

Using the string concatenation operator repeatedly to concatenate n strings requires time quadratic in n. It's an unfortunate consequence of fact that strings are immutable(Item 15). // Inappropriate use of string concatenation - Performs horribly! p…

ORA-01489: result of string concatenation is too long Cause: String concatenation result is more than the maximum size. Action: Make sure that the result is less than the maximum size. Reference: http://nimishgarg.blogspot.com/2012/06/ora-01489-resul…

昨天发现一个IDE提示: String concatenation as argument to 'StringBuffer.append()' call less... (Ctrl+F1) Reports String concatenation used as the argument to StringBuffer.append(),StringBuilder.append() orAppendable.append(). Such calls may profitably be turn…

Problem   Codeforces #541 (Div2) - E. String Multiplication Time Limit: 2000 mSec Problem Description Input Output Print exactly one integer — the beauty of the product of the strings. Sample Input 3aba Sample Output 3 题解:这个题的思维难度其实不大,需要维护什么东西很容易想到,或…

Given the root of a binary tree, each node has a value from 0 to 25 representing the letters 'a' to 'z': a value of 0 represents 'a', a value of 1 represents 'b', and so on. Find the lexicographically smallest string that starts at a leaf of this tre…

原题链接在这里:https://leetcode.com/problems/smallest-string-starting-from-leaf/ 题目: Given the root of a binary tree, each node has a value from 0 to 25 representing the letters 'a' to 'z': a value of 0 represents 'a', a value of 1 represents 'b', and so on…

Given the root of a binary tree, each node has a value from 0 to 25 representing the letters 'a' to 'z': a value of 0 represents 'a', a value of 1represents 'b', and so on. Find the lexicographically smallest string that starts at a leaf of this tree…

题目如下: You are given a string s, and an array of pairs of indices in the string pairs where pairs[i] = [a, b] indicates 2 indices(0-indexed) of the string. You can swap the characters at any pair of indices in the given pairs any number of times. Retu…

题目如下: Given the root of a binary tree, each node has a value from 0 to 25representing the letters 'a' to 'z': a value of 0 represents 'a', a value of 1 represents 'b', and so on. Find the lexicographically smallest string that starts at a leaf of thi…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 DFS BFS 日期 题目地址:https://leetcode.com/problems/smallest-string-starting-from-leaf/ 题目描述 Given the root of a binary tree, each node has a value from 0 to 25 representing the lett…

题目链接: http://codeforces.com/problemset/problem/710/E 题目大意: 问写N个字符的最小花费,写一个字符或者删除一个字符花费A,将当前的字符数量翻倍花费B. 题目思路: [动态规划][最短路] [动态规划]: 如果当前x不是2的倍数,那么一定需要单个字符增加或删除,而这个单个操作越靠后答案越优. dp(x)=a+min(dp(x-1),dp(x+1)) 如果当前x是2的倍数,那么有两种情况,一种是通过翻倍的方式获得,一种是通过累加的方式获得.只要比…

Codeforces 1120 C 题意:给一个串\(S\),将这个串分成\(t_1..t_m\),如果\(t_i\)在\(t_1..t_{i-1}\)中作为子串出现过,那么这个的代价是\(b\),否则如果\(|t_i|=1\),那么这个的代价是\(a\). 问最少代价. 思路:第一次现场敲对\(Suffix\ AutoMaton\)祭 首先考虑\(dp_i\)表示处理到第\(i\)个位置,最少的代价. 然后向后枚举一个在\(S_{1..i-1}\)中出现过的子串\(S_{i..j}\),转移\…

[题目链接]:http://codeforces.com/contest/797/problem/C [题意] 一开始,给你一个字符串s:两个空字符串t和u; 你有两种合法操作; 1.将s的开头字符加到t后面; 2.将t的最后一个字符加到u的后面去 要求最后使得s和t字符串变成空串; 并且得到的u的字符串的字典序最小; [题解] i层循环顺序枚举s字符串的每一个字符; 然后把这第i个字符s[i]加入到t的后面去->用一个栈来模拟; 然后维护栈顶的元素和s中剩下的字符串里面字典序最小的字母;->…

原题链接:https://codeforces.com/problemset/problem/1144/E tag:字符串模拟,大整数. 题意:给定两个字符串,求字典序中间串. 思路:可以把这个题当做一个26进制数的模拟.a~z分别代表0~25,然后求平均,在通过数字反求字符串. 然后写出这么个代码 #include<bits/stdc++.h> using namespace std; typedef unsigned long long ll; ll _input(ll); void _o…

题意:给定 n,x,y,表示你要建立一个长度为 n的字符串,如果你加一个字符要花费 x时间,如果你复制前面的字符要花费y时间,问你最小时间. 析:这个题,很明显的DP,dp[i]表示长度为 i 的字符串的最少花费,当 i 是偶数时,要么再加一个字符,要么从i/2中复制,如果为奇数,要么再加1个字符, 要么从i/2先加一个,再复制.即: 奇数 : dp[i] = min(dp[i-1]+x, dp[i/2+1]+y+x); 偶数 : dp[i] = min(dp[i-1]+x, dp[i/2]+y…

Making a String time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output You are given an alphabet consisting of n letters, your task is to make a string of the maximum possible length so that the f…

http://codeforces.com/contest/56/problem/D 题目大意: 一个字符串变为目标字符串,可以执行插入,置换和删除3种操作,求最少操作数. 思路:dp[i][j]代表当前串前i个变成目标串前j个的最小花费. #include<cstdio> #include<cmath> #include<cstring> #include<algorithm> #include<iostream> #define ll lon…

题目链接 给出一个图, 每个节点只有三种情况, a,b, c. a能和a, b连边, b能和a, b, c,连边, c能和b, c连边, 且无重边以及自环.给出初始的连边情况, 判断这个图是否满足条件. 由题意可以推出来b必然和其他的n-1个点都有连边, 所以初始将度数为n-1的点全都编号为b. 然后任选一个与b相连且无编号的点, 编号为1. 然后所有与1无连边的点都是3. 然后O(n^2)检查一下是否合理. #include <iostream> #include <vector>…

主题链接:点击打开链接 编辑距离.,== 一边dp虽然录制前体累,,依然是dp #include<iostream> #include<cstdio> #include<vector> #include<string.h> using namespace std; #define ll int #define N 1010 char s[N], t[N]; int dp[N][N], n, m; // 0为插入 1为删除 2 3为替换 struct node…

题意就是一次次翻转字符串 然后输出最终的字符串 暴力一发O(n*m)果然超时了 因为每次翻转的的都是a-1到对称位置 所以一个位置翻转两次等于没有操作 所以只需要记录一下len/2的位置前的操作次数 O(len/2)…… #include<stdio.h> #include<iostream> #include<algorithm> #include<math.h> #include<string.h> #include<string>…

[题目类型]二分答案 &题解: 只要你想到二分答案就不是难题了,但我当时确实是想不到. [时间复杂度]\(O(nlogn)\) &代码: #include <cstdio> #include <cmath> #include <iostream> #include <cstring> #include <vector> #include <algorithm> using namespace std; #define…