题目大意：给一个字符串，判断是否回文（忽略大小写，忽略非字母字符）。
#include <cstdio>
#include <cctype>
#include <cstring>
#define MAXN 100000 char str1[MAXN], str2[MAXN]; int main()
{
#ifdef LOCAL
freopen("in", "r", stdin);
#endif
while (gets(str1))
{
if (strcmp(str1, "DONE") == ) break;
int len1 = strlen(str1), len2 = ;
for (int i = ; i < len1; i++)
if (isalpha(str1[i]))
str2[len2++] = tolower(str1[i]);
bool palindrome = true;
for (int i = , j = len2-; i < j; i++, j--)
if (str2[i] != str2[j])
{
palindrome = false;
break;
}
if (palindrome) printf("You won't be eaten!\n");
else printf("Uh oh..\n");
}
return ;
}