标签：problem letter ase stream amp result force har out
Mike has a string s consisting of only lowercase English letters. He wants to change exactly one character from the string so that the resulting one is a palindrome.
A palindrome is a string that reads the same backward as forward, for example strings "z", "aaa", "aba", "abccba" are palindromes, but strings "codeforces", "reality", "ab" are not.
The first and single line contains string s (1?≤?|s|?≤?15).
Print "YES" (without quotes) if Mike can change exactly one character so that the resulting string is palindrome or "NO" (without quotes) otherwise.
abccaa
YES
abbcca
NO
abcda
YES
题意：输入一个字符串，如果仅仅更改一个字符串能使字符串是回文就输出YES，否则输出NO；
题解：分类讨论，如果字符串长度为偶数，对折比较只能有一对字符串不同；如果是奇数，对折比较有一对或零对字符串不同；
代码：
#include<iostream> #include<cstring> using namespace std; int main() { char str[20]; int i,l,j; while(cin>>str) { j=0; l=strlen(str); for(i=0;i<l/2;i++) { if(str[i]==str[l-i-1]) j++; } if(l%2==1) { if(j==l/2||j==l/2-1) cout<<"YES"<<endl; else cout<<"NO"<<endl; } else { if(j==l/2-1) cout<<"YES"<<endl; else cout<<"NO"<<endl; } } }
标签：problem letter ase stream amp result force har out
原文地址：http://www.cnblogs.com/GXXX/p/6814520.html
