"kmp c++" Code Answer's
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kmp c++
PRO_GrAMmER (IA Fahim)
on Dec 28, 2020
void computeLPSArray(char* pat, int M, int* lps)
{
int len = 0;
lps[0] = 0;
int i = 1;
while (i < M) {
if (pat[i] == pat[len]) {
len++;
lps[i] = len;
i++;
}
else
{
if (len != 0) {
len = lps[len - 1];
}
else
{
lps[i] = 0;
i++;
}
}
}
}
int matchFound=0;
void KMPSearch(char* pat, char* txt)
{
matchFound=0;
int M = strlen(pat);
int N = strlen(txt);
int lps[M];
computeLPSArray(pat, M, lps);
int i = 0;
int j = 0;
while (i < N) {
if (pat[j] == txt[i]) {
j++;
i++;
}
if (j == M) {
matchFound++;
// printf("Found pattern at index %d ", i - j);
j = lps[j - 1];
}
else if (i < N && pat[j] != txt[i]) {
if (j != 0)
j = lps[j - 1];
else
i = i + 1;
}
}
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