题目链接 一个简单的题目,但是却很少有人可以一次AC,比如我就瞎写wa了一次... 写本博算个教训录吧. 题目给出一个字符串,让你严格的改变一个字符使改变后的字符串是一个回文串. 回文串不用解释了.不懂自行百度. 需要注意两点: 1.如果长度为偶数,并且事先就是一个回文串,那么要输出no的,因为必须要改变一个字符串,在原本就是回文的基础上改变一下就不是回文串了. 2.如果长度为奇数,并且事先就是一个回文串,那么要输出yes,因为可以只改变最中间的那个字符,改后还是一个回文串. 其他的就是判断有几…

A. Mike and palindrome time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Mike has a string s consisting of only lowercase English letters. He wants to change exactly one character from the s…

A. Mike and palindrome time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Mike has a string s consisting of only lowercase English letters. He wants to change exactly one character from the s…

A. Mike and palindrome time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Mike has a string s consisting of only lowercase English letters. He wants to change exactly onecharacter from the st…

/* CF410div2 A. Mike and palindrome http://codeforces.com/contest/798/problem/A 水题 */ #include <cstdio> #include <algorithm> #include <cstring> #include <cmath> #include <vector> #include <queue> #include <iostream&g…

[题目链接]:http://codeforces.com/contest/798/problem/A [题意] 让你严格改变一个字符,使得改变后的字符串为一个回文串; 让你输出可不可能; [题解] 直接无脑暴力改就好; 或者按照回文串的规则; 如果a[i]和a[n-i+1]不同则cnt++ 然后看看最后cnt是不是恰好为1,或者为0然后字符串长度为奇数(那样中间那个字符可以任意改) [Number Of WA] 0 [完整代码] #include <bits/stdc++.h> using n…

A string is called palindrome if it reads the same from left to right and from right to left. For example "kazak", "oo", "r" and "mikhailrubinchikkihcniburliahkim" are palindroms, but strings "abb" and &qu…

Mike is the president of country What-The-Fatherland. There are n bears living in this country besides Mike. All of them are standing in a line and they are numbered from 1 to n from left to right. i-th bear is exactly ai feet high. A group of bears…

题目链接 TAG: 这是我近期做过最棒的一道贪心思维题,不容易想到,想到就出乎意料. 题意:给定两个含有N个正整数的数组a和b,让你输出一个数字k ,要求k不大于n/2+1,并且输出k个整数,范围为1~n的不重复数字, 要求这k个数字为下标的对应a和b中的数的和乘以2的值  分别大于a和b 的数组总和. 思路:首先对a进行降序排序,然后输出最大值的下标,随后进行幅度为2的枚举,对排序后的a2~an进行选择性输出下标,(注意,排序的时候用一个新数组开两个变量,一个index,一个v进行排序,可以用…

题目链接 时间复杂度 O(n*n*|s| ) 纯暴力,通过string.substr()函数来构造每一个字符串平移后的字符串. #include <iostream> #include <cstdio> #include <cstring> #include <algorithm> #include <cmath> #include <queue> #include <stack> #include <map>…