暴力很好写。。我还是太嫩了。。
//#define LOCAL
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#define MAXN 1000010 + 10
#define MAX 200 + 10
int cmp(const void *_a, const void *_b);
char word[MAXN][MAX];
int n = 0, len = 0;
int main()
{
#ifdef LOCAL
freopen("input.txt", "r", stdin);
//freopen("output.txt", "w", stdout);
#endif
int i;
char temp;
while(1)
{
// 数据输入
if((temp = getchar()) == EOF)
break;
if(isalpha(temp))
word[n][len++] = tolower(temp);
else if(isalpha(word[n][0]))
{
word[n++][len] = '\0';
len = 0;
}
}
qsort(word, n, sizeof(word[0]), cmp);
for(i = 0; i < n; i++)
{
if(strcmp(word[i], word[i + 1]))
printf("%s\n", word[i]);
}
return 0;
}
int cmp(const void *_a, const void *_b)
{
char *a = (char *) _a;
char *b = (char *) _b;
return strcmp(a, b);
}