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Copy pathKMPSearch.java
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76 lines (49 loc) · 1.15 KB
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package strings;
public class KMPSearch
{
public static boolean search(String str,String pat){
int n=str.length();
int m=pat.length();
int lps[]=new int[m];
computeLPS(pat,m,lps);
int i=0,j=0;
while(i<n){
if(str.charAt(i)==pat.charAt(j)){
i++;
j++;
}
if(j==m){
return true;
}
else if(i<n && str.charAt(i)!=pat.charAt(j)){
if(j!=0){
j=lps[j-1];
}
else{
i++;
}
}
}
return false;
}
public static void computeLPS(String pat,int m,int[] lps){
int i=1,j=0;
lps[0]=0;
while(i<m){
if(pat.charAt(i)==pat.charAt(j)){
j++;
lps[i]=j;
i++;
}
else{
if(j!=0){
j=lps[j-1];
}
else{
lps[i]=j;
i++;
}
}
}
}
}