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[其他] Print sums of all subsets of a given set

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心动则痛Oath 发表于 2016-10-14 12:23:49
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Given an array of integers, print sums of all subsets in it. Output sums can be printed in any order.
  1. Input : arr[] = {2, 3}
  2. Output: 0 2 3 5

  3. Input : arr[] = {2, 4, 5}
  4. Output : 0 2 4 5 6 7 9 11
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We can recursively solve this problem. There are total 2    nsubsets. For every element, we consider two choices, we include it in a subset and we don’t include it in a subset. Below is recursive solution based on this idea.  
  1. // C++ program to print sums of all possible
  2. // subsets.
  3. #include<bits/stdc++.h>
  4. using namespace std;

  5. // Prints sums of all subsets of arr[l..r]
  6. void subsetSums(int arr[], int l, int r,
  7.                 int sum=0)
  8. {
  9.     // Print current subset
  10.     if (l > r)
  11.     {
  12.         cout << sum << " ";
  13.         return;
  14.     }

  15.     // Subset including arr[l]
  16.     subsetSums(arr, l+1, r, sum+arr[l]);

  17.     // Subset excluding arr[l]
  18.     subsetSums(arr, l+1, r, sum);
  19. }

  20. // Driver code
  21. int main()
  22. {
  23.     int arr[] = {5, 4, 3};
  24.     int n = sizeof(arr)/sizeof(arr[0]);

  25.     subsetSums(arr, 0, n-1);
  26.     return 0;
  27. }
复制代码
Output:
  Note: We haven’t actually created sub-sets to find their sums rather we have just used recursion to find sum of non-contiguous sub-sets of the given set.
  The above mentioned techniques can be used to perform various operations on sub-sets like multiplication, division, XOR, OR, etc, without actually creating and storing the sub-sets and thus making the program memory efficient.
  This article is contributed by          Aditya Gupta    . If you like GeeksforGeeks and would like to contribute, you can also write an article using    contribute.geeksforgeeks.orgor mail your article to [email protected] See your article appearing on the GeeksforGeeks main page and help other Geeks.  
  Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.ncorrect, or you want to share more information about the topic discussed above
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大大大 发表于 2016-10-15 04:20:48
瞄瞄,不忍直视
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董婷 发表于 2016-10-21 11:53:49
到2016-10-21 走过了年少,脚起了水泡  
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mengchang 发表于 2016-11-3 06:34:56
大学就是大概学学!
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