public List<Integer> findSubstring(String s, String[] words) {

List<Integer>res=new ArrayList<Integer>();

int wlength=words.length;

if(wlength==0)

return res;

int size=words[0].length();

int slength=s.length();

if(wlength*size>slength)

return res;

HashMap<String, Integer>wordHashMap=new HashMap<String, Integer>();

for(int i=0;i<wlength;i++)

wordHashMap.put(words[i],!wordHashMap.containsKey(words[i])?1:wordHashMap.get(words[i])+1);

for(int i=0;i<slength-size*wlength+1;i++){

HashMap<String, Integer>tempHashMap=new HashMap<String, Integer>(wordHashMap);

for(int j=0;j<wlength;j++){

String subString=s.substring(i+j*size, i+(j+1)*size);

if(tempHashMap.containsKey(subString)){

int count=tempHashMap.get(subString);

if(count==1)

tempHashMap.remove(subString);

else

tempHashMap.replace(subString, count-1);

}else{

break;

}

}

if(tempHashMap.isEmpty())

res.add(i);

}

return res;

}