KMP算法


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
inline void GetNext(char *s) {
int l = strlen(s), t;
next[0] = -1;
for (int i = 1; i < l; ++i) {
t = next[i - 1];
while (s[t + 1] != s[i] && t >= 0)
t = next[t];
if (s[t + 1] == s[i])
next[i] = t + 1;
else
next[i] = -1;
}
}

inline void KMP(char *s1, char *s2) {
ans.clear();
GetNext(s2);//预处理next数组
int len_1 = strlen(s1);
int len_2 = strlen(s2);
int i = 0, j = 0;
while (j < len_1) {
if (s2[i] == s1[j]) {
++i;
++j;
if (i == len_2) {
ans.push_back(j - len_2 + 1);
i = next[i - 1] + 1;
}
} else {
if (i == 0)
j++;
else
i = next[i - 1] + 1;
}
}
}

文章作者: fightinggg
版权声明: 本博客所有文章除特別声明外,均采用 CC BY 4.0 许可协议。转载请注明来源 fightinggg !
  目录