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package jiuzhang.java.elementary;

public class StrStrSolution {

public int strStr(String source, String target) {

// write your code here

if (source == null || target == null || source.length() < target.length()){

return -1;

}

if (target.equals("")){

return 0;

}

for (int i = 0; i < source.length(); i++){

if (source.charAt(i) == target.charAt(0)){

if (source.length() - i < target.length()){

return -1;

}

int k = 0;

for (k = 1; k < target.length(); k++) {

if (target.charAt(k) != source.charAt(i + k)) {

break; //bug here, the first round fail does mean not cannot find the target

}

}

if (k == target.length()){

return i;

}

}

}

return -1;

}

public static void main(String[] args) {

// TODO Auto-generated method stub

String test = "";

if(test.equals("")){

System.out.println(test.charAt(0));

}

System.out.println(new StrStrSolution().strStr("source", "target"));

System.out.println(new StrStrSolution().strStr("", ""));

System.out.println(new StrStrSolution().strStr("abcdabcdefg", "bcd"));

}

}