Content 输入一个数 \(n\),输出第 \(n\) 个偶数位回文数. 数据范围:\(1\leqslant n\leqslant 10^{10^5}\). Solution 一看这吓人的数据范围,我就明白,这题明显是个结论题. 我们需要先找规律: 第一个:\(11\) 第二个:\(22\) 第三个:\(33\) 第四个:\(44\) \(...\) 第十个:\(1001\) 第十一个:\(1111\) \(...\) 嗯?那么第 \(n\) 个岂不是先输出 \(n\),再倒序输出 \(n\…

B. Lovely Palindromes 题目连接: http://www.codeforces.com/contest/688/problem/B Description Pari has a friend who loves palindrome numbers. A palindrome number is a number that reads the same forward or backward. For example 12321, 100001 and 1 are palin…

题目链接: B. Lovely Palindromes time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Pari has a friend who loves palindrome numbers. A palindrome number is a number that reads the same forward or ba…

题意:给一个数n,让你找出长度为偶数,并且是第 n 个回文数. 析:你多写几个就知道了,其实就是 n,然后再加上n的逆序,不过n有点大,直接用string 好了. 代码如下: #include <iostream> #include <cmath> #include <cstdlib> #include <set> #include <cstdio> #include <cstring> #include <algorithm&…

Description Pari has a friend who loves palindrome numbers. A palindrome number is a number that reads the same forward or backward. For example 12321, 100001 and 1 are palindrome numbers, while 112 and 1021 are not. Pari is trying to love them too,…

http://codeforces.com/problemset/problem/688/B B. Lovely Palindromes time limit per test 1 second memory limit per test 256 megabytes Pari has a friend who loves palindrome numbers. A palindrome number is a number that reads the same forward or backw…

A题:Opponents 直接模拟 #include <bits/stdc++.h> using namespace std; ]; int main() { int n,k; while(~scanf("%d%d",&n,&k)) { ,sta=,first=,ans; ;i<k;i++) { sta=; scanf("%s",ch); ;i<n;i++) sta&=(ch[i]-'); ) p++; ||(i==k…

本文出自   http://blog.csdn.net/shuangde800 刘汝佳<算法竞赛入门经典-训练指南>的动态规划部分的习题Beginner  打开 这个专题一共有25题,刷完后对dp的感觉提升了不少. 现把解题报告整理了一下,希望对大家能有帮助. 入门习题 (Exercises: Beginner) UVa11584 Partitioning by Palindromes 入门题目 LA4256 Salesman 入门题目 UVa10534 Wavio Sequence 可以转化…

Determine whether an integer is a palindrome. Do this without extra space. Some hints: Could negative integers be palindromes? (ie, -1) If you are thinking of converting the integer to string, note the restriction of using extra space. You could also…

UVA11584 https://www.luogu.org/problemnew/show/UVA11584 暑假开始刷lrj紫/蓝书DP题 这几天做的一道 思路 预处理出所有的回文串是否存在 前提 如果是j~i是回文串 方程 f[i]=min(f[i],f[j-1]+1); 代码 #include<iostream> #include<cstring> #include<cstdio> #include<algorithm> using namespac…