ICode9

这段时间重新刷了一下Leetcode，在此记录下自己容易出错的和经典的题目。 这是Leetcode第5题，寻找最长回文子序列，就是给定一个字符串S，找出其中的最长回文子串，并返回该子串。常用的方法有中心扩展法与Manacher算法，其中Manacher算法时间复杂度可以达到\(O(N)\), 空间复杂度\(O(N)\)，需要

Longest Palindromic Substring Given a string s, find the longest palindromic substring in s. You may assume that the maximum length of s is 1000. 给定一个字符串 s，找到 s 中最长的回文子串。你可以假设 s 的最大长度为 1000。 题目来源：力扣（LeetCode）链接：https://

    题目大意：判断一个不超过10^10的数N，能否在K步内通过加上自身的反转数变成回文数。     与A1023 Have fun with Numbers 相同，依然是大数加法，用vector<int>存储并按照要求反转相加，判断回文即可。     坑点在于开始的输入时，N 要设置成long long型，设置成 int 型会溢出导

Given a string s, find the longest palindromic substring in s. You may assume that the maximum length of s is 1000. Example 1: Input: “babad” Output: “bab” Note: “aba” is also a valid answer. Example 2: Input: “cbbd” Output: “bb” 问题： 寻找字

PAT A1019 General Palindromic Number 题目描述： 　　A number that will be the same when it is written forwards or backwards is known as a Palindromic Number. For example, 1234321 is a palindromic number. All single digit numbers are palindromic numbers.　　Alth

题目链接 http://codeforces.com/contest/1205/problem/C 题解 菜鸡永远做着变巨的梦 然而依然连div1BC题都不会做 要是那天去打cf怕是又要1题滚粗了。。。。 首先第一步显然是对于所有\(i+j\)为偶数的点(下称“偶点”)求出\(a_{i,j}\)的值，对于所有\(i+j\)为奇数的点(下称“奇点

P3126 [USACO15OPEN]回文的路径Palindromic Paths 看到这题题解不多，蒟蒻便想更加通俗易懂地分享一点自己的心得，欢迎大佬批评指正^_^ 像这种棋盘形的两边同时做的dp还有 P1006 传纸条, P1004 方格取数, T35377 大教室中传纸条 一、思路改进 对于这种题目最暴力的方法无非是分别枚

1019 General Palindromic Number (20 分) A number that will be the same when it is written forwards or backwards is known as a Palindromic Number. For example, 1234321 is a palindromic number. All single digit numbers are palindromic numbers. Although p

题目描述： Given a string S, find the longest palindromic substring in S. You may assume that the maximum length of S is 1000, and there exists one unique longest palindromic substring. 　　这是一道很有名的题目，相信很多人面试的时候会被问到。 　　本人算法能力

题目 Given a string s, find the longest palindromic substring in s. You may assume that the maximum length of s is 1000. Example1：   Input: "babad"   Output: "bab"   Note: "aba is also a valid answer. " Example2：   Input: "

题目 c++ 回文串，区间DP class Solution { public: int dp[1005][1005]; string longestPalindrome(string s) { int len = s.length(); int ii,jj; int m=0; for(int l=0;l<len;l++) {

Source: PAT_A1136 A Delayed Palindrome (20 分) Description: Consider a positive integer N written in standard notation with k+1 digits a​i​​ as a​k​​⋯a​1​​a​0​​ with 0 for all i and a​k​​>0. Then N is palindromic if and o

Given a string s, find the longest palindromic substring in s. You may assume that the maximum length of s is 1000. Example 1: Input: "babad" Output: "bab" Note: "aba" is also a valid answer. Example 2: Input: "cbbd"

传送门 当我打开Luogu题解发现这道题可以Hash+贪心的时候我的内心是崩溃的…… 但是看到这道题不都应该认为这是一道PAM的练手好题么…… 首先把原字符串重排为\(s_1s_ks_2s_{k-1}s_3s_{k-2}...\)之后，我们不难发现：在一种对原串的回文划分中，对应的一对字符串在新的字符串上对应了一

一、暴力法 public String longestPalindrome(String s) { //暴力算法 if(s.isEmpty()){ return s; } String res = s.substring(0,1); for (int i =0; i<s.length();i++){ for (int j=i+1;j<=s.length();j

题目： A number that will be the same when it is written forwards or backwards is known as a Palindromic Number. For example, 1234321 is a palindromic number. All single digit numbers are palindromic numbers. Non-palindromic numbers can be paired with pal

这题写的比较匆忙，代码有点乱，仅供参考。有个坑就是一开始给的数字就是回文串，要先判断，注意一下。 #include <iostream>#include <string.h>#include <cstdio>#include <algorithm>#include <cstdlib>#include <math.h>#include <queue>#include <stack>#include <v

方法一： class Solution { public: string longestPalindrome(string s) { if (s.size() < 2) return s; int n = s.size(), maxLen = 0, start = 0; for (int i = 0; i < n - 1; ++i) { searchPalindrome(s, i, i

题目:最长的回文串 Given a string s, find the longest palindromic substring in s. You may assume that the maximum length of s is 1000. Example 1: Input: "babad"Output: "bab"Note: "aba" is also a valid answer. Example 2: Input: "c

Consider a positive integer N written in standard notation with k+1 digits a​i​​ as a​k​​⋯a​1​​a​0​​ with 0≤a​i​​<10 for all i and a​k​​>0. Then N is palindromic if and only if a​i​​=a​k−i​​ for all i. Zero is w

A number that will be the same when it is written forwards or backwards is known as a Palindromic Number. For example, 1234321 is a palindromic number. All single digit numbers are palindromic numbers. Although palindromic numbers are most often considere

5. Longest Palindromic Substring Given a string s, find the longest palindromic substring in s. You may assume that the maximum length of s is 1000. Example 1: Input: "babad" Output: "bab" Note: "aba" is also a valid answer.

菜菜只能靠写简单字符串哈希维持生活。 题目传送门：LOJ #2484。 题意简述： 题面讲得很清楚了。 题解： 很显然从两边往中间推，能选的就选上这个贪心策略是对的。 如何判断能不能选上，直接字符串哈希吧。 有一个小细节：中间那块要不要选，即ans要不要加1？判一下串长即可。 #include <cstdio> #