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  1. // https://stackoverflow.com/questions/78722724/find-unique-or-combination-for-given-array
  2.  
  3. import java.util.*;
  4.  
  5. class Solution {
  6.     void solve(List<Integer> nums, int index, int lastIndex, int taken, int curr, Set<Integer> values) {
  7.         if (taken > 0) {
  8.             values.add(curr);
  9.         }
  10.         if (index >= nums.size()) {
  11.             return;
  12.         }
  13.  
  14.         // Take it.
  15.         if (lastIndex == -1 || nums.get(index) > nums.get(lastIndex)) {
  16.             int newOrValue = curr | nums.get(index);
  17.             if (!values.contains(newOrValue)) {
  18.                 solve(nums, index + 1, index, taken + 1, newOrValue, values);
  19.             }
  20.         }
  21.         // Leave it
  22.         solve(nums, index + 1, lastIndex, taken, curr, values);
  23.     }
  24.  
  25.     public List<Integer> getIncreasingSubsequenceOrValues(List<Integer> nums) {
  26.         Set<Integer> values = new HashSet<>();
  27.         solve(nums, 0 /* index */, -1 /* lastIndex */, 0 /* taken */, 0 /* curr */, values);
  28.         return new ArrayList<>(values);
  29.     }
  30. }
  31.  
  32. public class Main {
  33.     static void print(List<Integer> v) {
  34.         for (int el : v) {
  35.             System.out.print(el + " ");
  36.         }
  37.         System.out.println();
  38.     }
  39.  
  40.     static void test(List<Integer> nums) {
  41.         System.out.print("Testing for array: ");
  42.         print(nums);
  43.  
  44.         Solution solution = new Solution();
  45.         List<Integer> result = solution.getIncreasingSubsequenceOrValues(nums);
  46.  
  47.         print(result);
  48.     }
  49.  
  50.     public static void main(String[] args) {
  51.         test(Arrays.asList(4, 2, 4, 1));
  52.         test(Arrays.asList(3, 2, 4, 6));
  53.     }
  54. }
  55.  
Success #stdin #stdout 0.15s 55628KB
comments (?)
stdin 
Standard input is empty
stdout 
Testing for array: 4 2 4 1 
1 2 4 6 
Testing for array: 3 2 4 6 
2 3 4 6 7
https://ideone.com/NmfuVV
language:
Java (HotSpot 12)
created:
1 year ago
visibility:
secret

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