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public class SubstringWithConcatenationOfAllWords {
public List<Integer> findSubstring(String s, String[] words) {
List<Integer> result = new ArrayList<Integer>();
if (s == null || words == null) {
return result;
}
int wordLength = words[0].length();
int totalLength = wordLength * words.length;
if (s.length() < totalLength) {
return result;
}
Map<String, Integer> map = getMap(words);
for (int i = 0; i <= s.length() - totalLength; i++) {
String tmp = s.substring(i, i + wordLength);
if (map.containsKey(tmp) && check(s.substring(i, i + totalLength), words, map)) {
result.add(i);
}
}
return result;
}
private Map<String, Integer> getMap(String[] words) {
Map<String, Integer> map = new HashMap<String, Integer>();
for (String s : words) {
if (map.containsKey(s)) {
map.put(s, map.get(s) + 1);
} else {
map.put(s, 1);
}
}
return map;
}
private boolean check(String s, String[] words, Map<String, Integer> map) {
Map<String, Integer> tMap = new HashMap<String, Integer>();
int length = words[0].length();
for (int i = 0; i <= s.length() - length; i = i + length) {
String tmp = s.substring(i, i + length);
if (!map.containsKey(tmp)) {
return false;
}
if (tMap.containsKey(tmp)) {
tMap.put(tmp, tMap.get(tmp) + 1);
} else {
tMap.put(tmp, 1);
}
if (tMap.get(tmp) > map.get(tmp)) {
return false;
}
}
return true;
}
@Test
public void test() {
String s = "lingmindraboofooowingdingbarrwingmonkeypoundcake";
String[] words = new String[]{"fooo", "barr", "wing", "ding", "wing"};
List<Integer> result = findSubstring(s, words);
}
}
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