题目：
Description
Those days, many boys use beautiful girls' photos as avatars in forums. So it is pretty hard to tell the gender of a user at the first glance. Last year, our hero went to a forum and had a nice chat with a beauty (he thought so). After that they talked very often and eventually they became a couple in the network.
But yesterday, he came to see "her" in the real world and found out "she" is actually a very strong man! Our hero is very sad and he is too tired to love again now. So he came up with a way to recognize users' genders by their user names.
This is his method: if the number of distinct characters in one's user name is odd, then he is a male, otherwise she is a female. You are given the string that denotes the user name, please help our hero to determine the gender of this user by his method.
Input
Every line contains a non-empty string, that contains only lowercase English letters — the user name. This string contains at most 100 letters.
Output
If it is a female by our hero's method, print "CHAT WITH HER!" (without the quotes), otherwise, print "IGNORE HIM!" (without the quotes).
Sample Input
wjmzbmr
xiaodao
sevenkplus
Sample Output
CHAT WITH HER!
IGNORE HIM!
CHAT WITH HER!
————————————————
解析：利用数组来判断，可以利用两层来跟前面的比较来判断
#include <stdio.h>
#include <string.h>
char k[105];
int main()
{int l=0,cnt=0,shifou=0,s=0,i=0;while(~scanf("%s",k)){l=strlen(k);for(i=1;i<l;i++){for(s=0;s<i;s++){if(k[i]==k[s]){shifou=1; //shifou表示是否有一样的字符 break;}}if(shifou==0) cnt++;shifou=0; }if(cnt%2==0) printf("IGNORE HIM!\n");if(cnt%2==1) printf("CHAT WITH HER!\n");cnt=0;} return 0;
}