WA:30.串联所有单词的子串
仅能过 words 中不存在重复字符串的测试用例 😖
void nex(int *next, char *s)
{
next[0] = 0;
int now = 0, j = 1, lens = strlen(s);
while (j < lens)
{
if (s[now] == s[j])
next[j++] = ++now;
else if (now)
now = nex
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