C语言实现KMP算法
时间: 2023-11-25 21:46:56 浏览: 53
KMP算法的实现需要用到next数组,next数组的求解过程可以参考引用中的内容。下面是C语言实现KMP算法的代码:
```c
#include <stdio.h>
#include <string.h>
void getNext(char* pattern, int* next) {
int len = strlen(pattern);
int i = 0, j = -1;
next[0] = -1;
while (i < len) {
if (j == -1 || pattern[i] == pattern[j]) {
i++;
j++;
next[i] = j;
} else {
j = next[j];
}
}
}
int kmp(char* text, char* pattern) {
int n = strlen(text);
int m = strlen(pattern);
int i = 0, j = 0;
int* next = (int*)malloc(sizeof(int) * m);
getNext(pattern, next);
while (i < n && j < m) {
if (j == -1 || text[i] == pattern[j]) {
i++;
j++;
} else {
j = next[j];
}
}
free(next);
if (j == m) {
return i - j;
} else {
return -1;
}
}
int main() {
char text[] = "ABABDABACDABABCABAB";
char pattern[] = "ABABCABAB";
int pos = kmp(text, pattern);
if (pos == -1) {
printf("Pattern not found.\n");
} else {
printf("Pattern found at position %d.\n", pos);
}
return 0;
}
```
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