class Solution {
public String largestTimeFromDigits(int[] A) {
List<Integer> digits =Arrays.stream(A).boxed().collect(Collectors.toList());
List<Integer> permutations = new ArrayList<Integer>();
permutations = permute(digits,0,permutations);
int result = -1;
for (Integer i: permutations){
if(i % 100 < 60 && i / 100 < 24 && i > result){
result = i;
}
}
return result == -1? "" : "" + String.format("%02d",result / 100) + ":" + String.format("%02d",result % 100);
}
List<Integer> permute(List<Integer> arr, int k, List<Integer> result){
for(int i = k; i < arr.size(); i++){
java.util.Collections.swap(arr, i, k);
permute(arr, k+1, result);
java.util.Collections.swap(arr, k, i);
}
if (k == arr.size() -1){
result.add(Integer.parseInt(""+arr.get(0) + arr.get(1) + arr.get(2) + arr.get(3)));
}
return result;
}
}
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