Implement strStr()
Implement strStr().
Returns the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack.
public class Solution {
public int strStr(String haystack, String needle) {
if (haystack == null || needle == null) {
return -1;
}
if (needle.length() == 0) {
return 0;
}
for (int i = 0; i <= haystack.length() - needle.length(); i++) {
for (int j = 0; j < needle.length(); j++) {
if (haystack.charAt(i + j) != needle.charAt(j)) {
break;
}
if (j == needle.length() - 1) {
return i;
}
}
}
return -1;
}
}
Hope this helps,
Michael